Jenny paid $176 for 22 T-shirts, which is $8 per T-shirt .
What is unitary method?The unitary method, commonly referred to as the unit rate or the single quantity method, is a mathematical approach for resolving issues requiring proportional connections between numbers. Finding the value of one unit of a quantity, which is frequently used as a reference or a benchmark, and utilising that value to compute or compare other numbers are both involved in this process.
In other words, you may compute the value or rate of one unit of a quantity using the unitary technique, and then use that rate to derive the value or rate of another quantity. This approach is frequently employed in a variety of real-world contexts, including the computation of costs, rates, ratios, and proportions.
Given:
Jenny paid $176 for 22 T-shirts.
To find the cost per T-shirt, we need to divide the total cost by the number of T-shirts.
Using Unitary method;
$176 ÷ 22 = $8 per T-shirt.
Therefore, D is correct statement: Jenny paid $176 for 22 T-shirts, which is $8 per T-shirt .
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Correct Question:
Jenny is in charge of ordering T-shirts for the math club at her school. If she paid $176 for 22 T-shirts, which of the following statements is true?
A. Jenny paid $176 for 22 T-shirts, which is $20 per T-shirt.
B. Jenny paid $176 for 22 T-shirts, which is $11 per T-shirt.
C. Jenny paid $176 for 22 T-shirts, which is $12 per T-shirt.
D. Jenny paid$176 for 22 T-shirts, which is $8 per T-shirt.
find the partial derivatives of the function f(x,y)=xye−9y
The partial derivatives of the function f(x,y) = xy*e^(-9y) with respect to x and y are: ∂f/∂x = ye^(-9y), and ∂f/∂y = x(-9y*e^(-9y)) + e^(-9y).
The first partial derivative concerning x is obtained by treating y as a constant and differentiating concerning x. The result is ye^(-9y), which means that the rate of change of f concerning x is equal to ye^(-9y).
The second partial derivative concerning y is obtained by treating x as a constant and differentiating concerning y. The result is x(-9ye^(-9y)) + e^(-9y), which means that the rate of change of f concerning y is equal to x times -9ye^(-9y) plus e^(-9y).
To better understand these partial derivatives, we can analyze the behavior of the function f(x,y) = xy*e^(-9y). As we can see, the function is the product of three terms: x, y, and e^(-9y). The term e^(-9y) represents a decreasing exponential function that approaches zero as y increases. Therefore, the value of f(x,y) decreases as y increases. The terms x and y represent a linear function that increases as x and y increase. Therefore, the value of f(x,y) increases as x and y increase.
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Jamal measures the round temperature dial on a thermostat and calculates that it has a circumference of 87.92 millimeters. What is the dial's radius?
The dial's radius is approximately 13.99 millimeters.
What is formula of circumference?The circumference of a circle is given by the formula:
C = 2πr
where C is the circumference, π is the constant pi (approximately equal to 3.14159), and r is the radius of the circle.
The circumference C in this instance is 87.92 millimeters. We can adjust the equation to address for the sweep:
r = C / 2π
Substituting the given value for C, we get:
r = 87.92 mm / (2π)
r ≈ 13.99 mm
As a result, the dial has a radius of about 13.99 millimeters.
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Write a formula for a two-dimensional vector field which has all vectors of length 1 and perpendicular to the position vector at that point.
We can define the vector field as:F(x,y) = v = ⟨−y,x⟩/√(x²+y²).
This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point
What are perpendicular lines?Perpendicular lines are lines that intersect at a right angle (90 degrees).
Let's consider a two-dimensional vector field, denoted by F(x,y), where F is a vector function of two variables x and y. We want all vectors in this field to have length 1 and to be perpendicular to the position vector at each point.
The position vector at a point (x,y) is given by r = x, y , so we need to find a vector that is perpendicular to r and has length 1. One such vector is \ -y, x .
To make sure that all vectors in the field have length 1, we can normalize this vector by dividing it by its magnitude:
v = ⟨−y,x⟩/√(x²+y²).
Finally, we can define the vector field as:
F(x,y) = v = ⟨−y,x⟩/√(x²+y²).
This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point.
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We can define the vector field as:F(x,y) = v = ⟨−y,x⟩/√(x²+y²).
This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point
What are perpendicular lines?Perpendicular lines are lines that intersect at a right angle (90 degrees).
Let's consider a two-dimensional vector field, denoted by F(x,y), where F is a vector function of two variables x and y. We want all vectors in this field to have length 1 and to be perpendicular to the position vector at each point.
The position vector at a point (x,y) is given by r = x, y , so we need to find a vector that is perpendicular to r and has length 1. One such vector is \ -y, x .
To make sure that all vectors in the field have length 1, we can normalize this vector by dividing it by its magnitude:
v = ⟨−y,x⟩/√(x²+y²).
Finally, we can define the vector field as:
F(x,y) = v = ⟨−y,x⟩/√(x²+y²).
This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point.
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[infinity]consider the series ∑ 1/n(n+2)n=1 determine whether the series converges, and if it converges, determine its value.Converges (y/n) = ___Value if convergent (blank otherwise = ____
The value of the series is: ∑ 1/n(n+2) = lim N→∞ S(N) = 1/2.
The series ∑ 1/n(n+2)n=1 converges. To determine its value, we can use the partial fraction decomposition:
1/n(n+2) = 1/2 * (1/n - 1/(n+2))
Using this decomposition, we can rewrite the series as:
∑ 1/n(n+2) = 1/2 * (∑ 1/n - ∑ 1/(n+2))
The first series ∑ 1/n is the harmonic series, which diverges. However, the second series ∑ 1/(n+2) is a shifted version of the harmonic series, and it also diverges. But since we are subtracting a divergent series from another divergent series, we can use the limit comparison test to determine whether the original series converges or diverges. Specifically, we can compare it to the series ∑ 1/n, which we know diverges. This gives:
lim n→∞ 1/n(n+2) / 1/n = lim n→∞ (n+2)/n^2 = 0
Since the limit is less than 1, we can conclude that the series ∑ 1/n(n+2) converges. To find its value, we can evaluate the partial sums:
S(N) = 1/2 * (∑_{n=1}^N 1/n - ∑_{n=1}^N 1/(n+2))
= 1/2 * (1/1 - 1/3 + 1/2 - 1/4 + ... + 1/(N-1) - 1/(N+1))
As N approaches infinity, the terms in the parentheses cancel out except for the first and last terms:
S(N) → 1/2 * (1 - 1/(N+1))
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The point p(4,-2) Is dialated by a scale factor of 1.5 about the point (0,-2) The resluting point is point q. what are the points of q ,A(5.5, -2), B(5.5, -3.5), C(6,-2), D(6,-3)
The point Q after dilation with a scale factor of 1.5 about the point (0, -2) is (6, -2). So, correct option is C.
To find the new coordinates of point P after dilation with a scale factor of 1.5 about the point (0, -2), we can use the following formula:
Q(x, y) = S(x, y) = (1.5(x - 0) + 0, 1.5(y + 2) - 2)
Substituting the coordinates of point P (4, -2), we get:
Q(x, y) = S(4, -2) = (1.5(4 - 0) + 0, 1.5(-2 + 2) - 2)
Q(x, y) = S(4, -2) = (6, -2)
Therefore, the new point after dilation is Q(6, -2).
To check which of the given points A, B, C, and D match the new point Q, we can compare their coordinates. Only point C(6, -2) matches the new point Q, so that must be the answer. Points A, B, and D do not match the new point.
So, correct option is C.
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3.48 Referring to Exercise 3.39, find
(a) f(y|2) for all values of y;
(b) P(Y = 0 | X = 2).
this is 3.39
3.39 From a sack of fruit containing 3 oranges, 2 apples, and 3 bananas, a random sample of 4 pieces of fruit is selected. If X is the number of oranges and Y is the number of apples in the sample, find (a) the joint probability distribution of X and Y ; (b) P[(X, Y ) ∈ A], where A is the region that is given by {(x, y) | x + y ≤ 2}.
Referring to Exercise 3.39,
(a) f(y|2) for all values of y is f(2|2) = P(Y=2|X=2) = P(X=2, Y=2) / P(X=2) = (1/14) / (3/14) = 1/3
(b) P(Y = 0 | X = 2) = 1
To find f(y|2), we need to first calculate the conditional probability of Y=y given that X=2, which we can do using the joint probability distribution we found in part (a) of Exercise 3.39:
P(Y=y|X=2) = P(X=2, Y=y) / P(X=2)
We know that P(X=2) is equal to the probability of selecting 2 oranges out of 4 fruits, which can be calculated using the hypergeometric distribution:
P(X=2) = (3 choose 2) * (2 choose 0) / (8 choose 4) = 3/14
To find P(X=2, Y=y), we need to consider all the possible combinations of selecting 2 oranges and y apples out of 4 fruits:
P(X=2, Y=0) = (3 choose 2) * (2 choose 0) / (8 choose 4) = 3/14
P(X=2, Y=1) = (3 choose 2) * (2 choose 1) / (8 choose 4) = 3/14
P(X=2, Y=2) = (3 choose 2) * (2 choose 2) / (8 choose 4) = 1/14
Therefore, f(y|2) is:
f(0|2) = P(Y=0|X=2) = P(X=2, Y=0) / P(X=2) = (3/14) / (3/14) = 1
f(1|2) = P(Y=1|X=2) = P(X=2, Y=1) / P(X=2) = (3/14) / (3/14) = 1
f(2|2) = P(Y=2|X=2) = P(X=2, Y=2) / P(X=2) = (1/14) / (3/14) = 1/3
To find P(Y=0|X=2), we can use the conditional probability formula again:
P(Y=0|X=2) = P(X=2, Y=0) / P(X=2) = 3/14 / 3/14 = 1
Therefore, P(Y=0|X=2) = 1.
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Please help if you can, i don't understand
Answer: I believe -2 is the answer
Step-by-step explanation: To solve for the function over an interval, you need to know the equation of the function. If you have the equation, you can plug in the values of the interval into the equation to find the corresponding y-values. For example, if the function is y = 2x + 1 and the interval is [0,3], you can plug in x = 0 and x = 3 to find the corresponding y-values and get the ordered pairs (0,1) and (3,7).
Find a basis for the set of vectors in R2 on the line y 19x. A basis for the set of vectors in R2 on the line y 19x is (Use a comma to separate vectors as needed.)
A basis for the set of vectors in R2 on the line y = 19x is {(1, 19)}.
How to find a basis for the set of vectors?To find a basis for the set of vectors in R2 on the line y = 19x, we need to find a vector that lies on the line and can represent any other vector on the line through scalar multiplication.
1. Choose a point on the line y = 19x. Let's choose the point (1, 19) since when x = 1, y = 19(1) = 19.
2. Create a vector from the origin to the chosen point. The vector would be v = (1, 19).
3. Verify that this vector lies on the line. The equation of the line is y = 19x, and our vector v = (1, 19) satisfies this equation since 19 = 19(1).
So, a basis for the set of vectors in R2 on the line y = 19x is {(1, 19)}. Any other vector on the line can be represented as a scalar multiple of this basis vector.
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Solve for triangle Above
Answer:
X = 24.4
Step-by-step explanation:
for the triangle we use sin b/c it contain both hyp and opposite so
sin(35°) = 14/x
sin(35) × X = 14
X = 14 / (sin(35)
X = 24.4 ... it is the answer of hypotenus of the
triangle
Answer:
Step-by-step explanation:
Help AGAIN!
Which one cheaper and by how much?
View attachment below
Answer: Website A is cheaper, by an amount of, £0.29.
Step-by-step explanation: Here, the problem is simply about, initially adding, and then finding difference between the added results.
That is,
For Website A,
Net Cost = £49.95 + £4.39
= £54.34
Similarly,
For Website B,
Net Cost = £47.68 + £6.95
= £54.63
Therefore, we can clearly see,
Website A is cheaper by,
£(54.63 - 54.34) = £0.29
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Solve the equation x² + 4x - 11 = 0 by completing the square.
Fill in the values of a and b to complete the solutions.
x = a - (squared)b
x = a + (squared) b
The required values are -2+√15, -2-√15.
What is a quadratic equation?
Any equation in algebra that can be written in the standard form where x stands for an unknown value, where a, b, and c stand for known values, and where a 0 is true is known as a quadratic equation.
Here, we have
Given: x² + 4x - 11 = 0
we have to find the values of a and b to complete the solutions.
The given equation is x² + 4x - 11 = 0
The general form of a quadratic equation is ax² + bx + c = 0
Comparing with the given equation we have
a = 1
b = 4
c = -11
Rearranging the equation:
x² + 4x = 11
Finding (b/2)²
(4/2)² = 4
Adding to both sides of the equation
x² + 4x + 4 = 11 + 4
(x+2)² = 15
x + 2 = ±√15
x = -2 ±√15
Hence, the required values are -2+√15, -2-√15.
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Find an equation of the tangent line to the curve y=8x at the point (2,64)
Equation of the tangent line to the curve y=8x is y = 8x + 48.
How do we need to find the slope of the tangent at that point?Derivative of the curve, we get:
dy/dx = 8
This means that the slope of the tangent line to the curve at any point is 8.
So, at the point (2,64), the slope of the tangent line is 8.
By point-slope form of a line, we will find the equation of the tangent line:
y - y1 = m(x - x1)
where m is the slope and (x1,y1) is the given point.
Plugging in the values, we get:
y - 64 = 8(x - 2)
Simplifying, we get:
y = 8x + 48
Equation of the tangent line to the curve y=8x at the point (2,64) is y = 8x + 48.
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Please solve this geometry problem.
hope this helps you .
evaluate the integral taking ω:0≤x≤1,0≤y≤4 ∫∫2xy^2dxdy
The value of the integral ∫∫R 2xy^2 dA over the given region R is 64/3.
To evaluate the integral ∫∫R 2xy^2 dA over the region R given by 0 ≤ x ≤ 1 and 0 ≤ y ≤ 4, we integrate with respect to x first, and then with respect to y:
∫∫R 2xy^2 dA = ∫[0,4] ∫[0,1] 2xy^2 dx dy
Integrating with respect to x, we get:
∫[0,4] ∫[0,1] 2xy^2 dx dy = ∫[0,4] (y^2) [x^2]0^1 dy
Simplifying the expression inside the integral, we get:
∫[0,4] (y^2) [x^2]0^1 dy = ∫[0,4] y^2 dy
Integrating with respect to y, we get:
∫[0,4] y^2 dy = [y^3/3]0^4
Substituting the limits of integration and simplifying, we get:
[y^3/3]0^4 = (4^3/3) - (0^3/3) = 64/3
Therefore, the value of the integral ∫∫R 2xy^2 dA over the given region R is 64/3.
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s it possible that ca = i4 for some 4 ×2 matrix c? why or why not?
No, it is not possible that CA = I4 for some 4 × 2 matrix C, where A is a 4 × 2 matrix and I4 is the 4 × 4 identity matrix.
1. Recall that the identity matrix I4 is a 4 × 4 matrix with ones on the diagonal and zeros elsewhere.
2. In matrix multiplication, the number of columns in the first matrix must equal the number of rows in the second matrix.
3. If C is a 4 × 2 matrix and A is a 4 × 2 matrix, then matrix multiplication CA results in a 4 × 2 matrix, as the number of rows in C (4) and the number of columns in A (2) determine the dimensions of the resulting matrix.
4. Since CA produces a 4 × 2 matrix, it cannot be equal to the 4 × 4 identity matrix I4, as the dimensions are not the same.
Therefore, it is not possible for CA = I4 for some 4 × 2 matrix C.
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prove that x2 2: x for all x e z.
We have demonstrated that x² ≥ x for all integers x. Therefore, the statement x² ≥ x for all x ∈ Z is true.
What is inequality?An inequality is a relation that compares two numbers or other mathematical expressions in an unequal way. The majority of the time, size comparisons between two numbers on the number line are made.
To prove that x² ≥ x for all x ∈ Z, we need to show that the inequality holds true for any arbitrary integer value of x.
We can prove this by considering two cases:
Case 1: x ≥ 0
If x ≥ 0, then x² ≥ 0 and x ≥ 0. Therefore, x² ≥ x.
Case 2: x < 0
If x < 0, then x² ≥ 0 and x < 0. Therefore, x² > x.
In either case, we have shown that x² ≥ x for all integers x. Therefore, the statement x² ≥ x for all x ∈ Z is true.
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There are four blood types, and not all are equally likely
to be in blood banks. In a certain blood bank, 49% of
donations are Type O blood, 27% of donations are Type
A blood, 20% of donations are Type B blood, and 4% of
donations are Type AB blood. A person with Type B
blood can safely receive blood transfusions of Type O
and Type B blood.
What is the probability that the 4th donation selected at
random can be safely used in a blood transfusion on
someone with Type B blood?
O (0.31)³(0.69)
O (0.51)³(0.49)
O (0.69)³(0.31)
O (0.80)³(0.20)
Answer:
The probability of the 4th donation being Type O or Type B is:
P(Type O or B) = P(Type O) + P(Type B) = 0.49 + 0.20 = 0.69
The probability of the 4th donation being safe for someone with Type B blood is the probability that it is Type O or Type B, which is 0.69. Therefore, the probability that the 4th donation selected at random can be safely used in a blood transfusion on someone with Type B blood is:
P(safe for Type B) = 0.69
Answer: (0.69)³(0.31)
find the limit of the following sequence or determine that the sequence diverges. {tan^−1( 4n/ 4n +5)}
The limit of the given sequence is π/4, and the sequence converges to this value.
The given sequence is {tan^−1(4n/(4n+5))}. To determine if the sequence converges or diverges, we can analyze the limit of the function as n approaches infinity.
As n goes to infinity, the function behaves like tan^−1(4n/4n), which simplifies to tan^−1(1). Since the arctangent function has a range of (-π/2, π/2), tan^−1(1) falls within this range, and it is equal to π/4 (or 45° in degrees).
Now, let's consider the difference between the given function and the simplified one: (4n+5) - 4n = 5. As n becomes larger, the effect of the constant term 5 becomes negligible. Consequently, the function approaches tan^−1(1) as n approaches infinity.
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An element with mass 310 grams decays by 8.9% per minute. How much of the element is remaining after 19 minutes, to the nearest 10th of a gram?
please show ur work
Answer:
52.7 g
Step-by-step explanation:
We are given;
Initial mass of the element is 310 g
Rate of decay 8.9% per minute
Time for the decay 19 minutes
We are required to determine the amount of the element that will remain after 19 minutes.
We can use the formula;
New mass = Original mass × (1-r)^n
Where n is the time taken and r is the rate of decay.
Therefore;
Remaining mass = 310 g × (1-0.089)^19
= 52.748 g
= 52.7 g (to the nearest 10th)
Thus, the mass that will remain after 9 minutes will be 52.7 g
(b) region r is the basRegion R is the base of a soli., each cross section perpendicular to the x axis is a semi circle. Write, but do not evaluate, an integral expression that would compute the volume of the solid
of a
An integral expression that would compute the volume of the solid is [tex]V = \int\limits^a_b {1/2 \pi [R(x)]^2} \, dx[/tex]
What is integral expression?An integral expression is a mathematical statement that represents the area under a curve or the volume of a solid in three-dimensional space. It is written using integral notation, which involves an integral sign, a function to be integrated, and limits of integration.
According to given information:If each cross section perpendicular to the x-axis is a semicircle, then the radius of each cross section depends on the x-coordinate of the center of the cross section. Let R(x) be the radius of the cross section at x.
To find the volume of the solid, we can integrate the area of the cross section over the interval of x that defines the base R. The area of each cross section is given by the formula for the area of a semicircle:
[tex]A(x) = (1/2)[/tex][tex]\pi[R(x)]^2[/tex]
The volume of the solid can be found by integrating A(x) over the base R:
[tex]V = \int\limits^a_b {1/2 \pi [R(x)]^2} \, dx[/tex]
where a and b are the limits of integration for x that define the base R.
Note that we are integrating with respect to x, so we need to express the radius R(x) in terms of x.
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Write the equation in standard form for the circle passing through (–8,4) centered at the origin.
Answer:
x² + y² = 80
Step-by-step explanation:
Pre-SolvingWe are given that a circle has the center at the origin (the point (0,0)) and passes through the point (-8,4).
We want to write the equation of this circle in the standard equation. The standard equation is (x-h)² + (y-k)² = r² where (h,k) is the center and r is the radius.
SolvingAs we are given the center, we can plug its values into the equation.
Substitute 0 as h and 0 as k.
(x-0)² + (y-0)² = r²
This becomes:
x² + y² = r²
Now, we need to find r².
As the circle passes through (-8,4), we can use its values to help solve for r².
Substitute -8 as x and 4 as y.
(-8)² + (4)² = r²
64 + 16 = r²
80 = r²
Substitute 80 as r².
x² + y² = 80
using homework 10 data: using α = .05, p = 0.038 , your conclusion is _________.
Hi! Based on the information provided, using homework 10 data with a significance level (α) of 0.05 and a p-value of 0.038, your conclusion is that you would reject the null hypothesis.
This is because the p-value (0.038) is less than the significance level (0.05), indicating that there is significant evidence to suggest that the alternative hypothesis is true. Therefore, the conclusion is made based on the evidence to suggest that there is a statistically significant difference between the groups being compared in the study analyzed in homework 10.
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what is the length of the third side of an isoceles triangle if2 sides are 2 and 2?
The length of the third side of this isosceles triangle is 2 units.
We have,
If two sides of an isosceles triangle are equal, then the third side must also be equal in length.
So,
If two sides of the triangle are 2 and 2, the length of the third side must also be 2.
Thus,
The length of the third side of this isosceles triangle is 2 units.
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The following table gives the mean and standard deviation of reaction times in seconds) for each of two different stimuli, Stimulus 1 Stimulus 2 Mean 6.0 3.2 Standard Deviation 1.4 0.6 If your reaction time is 4.2 seconds for the first stimulus and 1.8 seconds for the second stimulus, to which stimulus are you reacting (compared to other individuals) relatively more quickly?
z-score for Stimulus 2 (-2.33) is more negative than the z-score for Stimulus 1 (-1.29), you are reacting relatively more quickly to Stimulus 2 compared to other individuals.
How to determine to which stimulus you are reacting relatively more quickly?We need to calculate the z-scores for your reaction times for each stimulus.
For Stimulus 1:
z-score = (your reaction time - mean reaction time for Stimulus 1) / standard deviation for Stimulus 1
z-score = (4.2 - 6.0) / 1.4
z-score = -1.29
For Stimulus 2:
z-score = (your reaction time - mean reaction time for Stimulus 2) / standard deviation for Stimulus 2
z-score = (1.8 - 3.2) / 0.6
z-score = -2.33
The more negative the z-score, the farther away your reaction time is from the mean.
Therefore, since the z-score for Stimulus 2 (-2.33) is more negative than the z-score for Stimulus 1 (-1.29), you are reacting relatively more quickly to Stimulus 2 compared to other individuals.
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2. find the angle in the figure in both radion measure and
angle measure.
ест
6
5cm
The measure of the central angle is 86 degrees.
How to find the central angle?The length of the arc is 9 cm and the radius is 6 centimetres. Therefore, let's find the central angle as follows:
Hence,
length of an arc = ∅ / 360 × 2πr
where
r = radius∅ = central angleTherefore,
length of arc = 9 cm
radius = 6 cm
Therefore,
9 = ∅ / 360 × 2 × 3.14 × 6
9 = 37.68∅ / 360
cross multiply
3240 = 37.68∅
divide both sides by 37.68
∅ = 3240 / 37.68
∅ = 85.9872611465
∅ = 86 degrees.
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I think I understand how to do this but the answer I think it is goes past the graph?
The other root of the quadratic equation include the following (-4, 0).
What is the vertex form of a quadratic equation?In Mathematics and Geometry, the vertex form of a quadratic equation is given by this formula:
y = a(x - h)² + k
Where:
h and k represents the vertex of the graph.a represents the leading coefficient.For the given quadratic function, we have;
y = a(x - h)² + k
0 = a(8 - 2)² - 5
0 = 36a - 5
5 = 36a
a = 5/36
Therefore, the required quadratic function in vertex form is given by;
y = 5/36(x - 2)² - 5
0 = 5/36(x - 2)² - 5
5 = 5/36(x - 2)²
36 = (x - 2)²
±6 = x - 2
x = -6 + 2
x = -4.
Other root = (-4, 0).
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x is an erlang (n,λ) random variable with parameter λ = 1/3 and expected value e[x] = 15. (a) what is the value of the parameter n? (b) what is the pdf of x? (c) what is var[x]?
The pdf of x is f(x) = (x^4 * e^(-x/3)) / 1620.
the variance of x is var[x] = 45.
(a) Since x is an Erlang (n, λ) random variable with expected value e[x] = 15 and λ = 1/3, we have:
e[x] = n/λ = n/(1/3) = 3n
Therefore, we have:
3n = 15
n = 5
So the value of the parameter n is 5.
(b) The probability density function (pdf) of an Erlang (n, λ) random variable is given by:
f(x) = (λ^n * x^(n-1) * e^(-λx)) / (n-1)!
Substituting λ = 1/3 and n = 5, we have:
f(x) = (1/3)^5 * x^4 * e^(-x/3) / 4!
= (x^4 * e^(-x/3)) / 1620
Therefore, the pdf of x is f(x) = (x^4 * e^(-x/3)) / 1620.
(c) The variance of an Erlang (n, λ) random variable is given by:
var[x] = n/λ^2 = n/(1/λ)^2
Substituting λ = 1/3 and n = 5, we have:
var[x] = 5/(1/(1/3))^2
= 45
Therefore, the variance of x is var[x] = 45.
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For two programs at a university, the type
of student for two majors is as follows.
Find the probability a student is a science major,
given they are a graduate student.
Answer:
Step-by-step explanation:
To find the probability that a student is a science major given that they are a graduate student, we need to use Bayes' theorem:
P(Science | Graduate) = P(Graduate | Science) * P(Science) / P(Graduate)
We know that P(Science) = 0.45 and P(Liberal Arts) = 0.55, and that P(Graduate | Science) = 0.35 and P(Graduate | Liberal Arts) = 0.25. We also know that the total probability of being a graduate student is:
P(Graduate) = P(Graduate | Science) * P(Science) + P(Graduate | Liberal Arts) * P(Liberal Arts)
Plugging in the values, we get:
P(Graduate) = 0.35 * 0.45 + 0.25 * 0.55 = 0.305
Now we can calculate the probability of being a science major given that the student is a graduate student:
P(Science | Graduate) = 0.35 * 0.45 / 0.305 = 0.515
Therefore, the probability that a student is a science major, given they are a graduate student, is approximately 0.515.
Answer:
0.72
Step-by-step explanation:
trust me
Help please!
5/8 ÷ 1/8
Answer: 5
5/8/1/8, you can do 5x8 and also do 8x1 because you can not divide fractions after that you get 40/8 then you divide 40/8 is 5 so the answer is 5
Given: A_n = 30/3^n Determine: (a) whether sigma _n = 1^infinity (A_n) is convergent. _____
(b) whether {An} is convergent. _____
If convergent, enter the limit of convergence. If not, enter DIV.
As n increases, 3^n becomes larger, making the fraction 30/3^n approach zero. Therefore, the sequence {A_n} is convergent, and the limit of convergence is 0. (a) Σ(A_n) is convergent and (b) {A_n} is convergent with the limit of convergence equal to 0.
(a) To determine whether sigma _n = 1^infinity (A_n) is convergent, we need to take the sum of the sequence A_n from n=1 to infinity:
sigma _n = 1^infinity (A_n) = A_1 + A_2 + A_3 + ...
Substituting A_n = 30/3^n, we get:
sigma _n = 1^infinity (A_n) = 30/3^1 + 30/3^2 + 30/3^3 + ...
To simplify this, we can factor out a common factor of 30/3 from each term:
sigma _n = 1^infinity (A_n) = 30/3 * (1/3^0 + 1/3^1 + 1/3^2 + ...)
Now, we recognize that the expression in parentheses is a geometric series with first term a=1 and common ratio r=1/3. The sum of an infinite geometric series with first term a and common ratio r is:
sum = a / (1 - r)
Applying this formula to our series, we get:
sigma _n = 1^infinity (A_n) = 30/3 * (1/ (1 - 1/3)) = 30/2 = 15
Therefore, sigma _n = 1^infinity (A_n) is convergent, with a limit of 15.
(b) To determine whether {An} is convergent, we need to take the limit of the sequence A_n as n approaches infinity:
lim n->infinity (A_n) = lim n->infinity (30/3^n) = 0
Therefore, {An} is convergent, with a limit of 0.
(a) To determine if the series Σ(A_n) from n=1 to infinity is convergent, we can use the ratio test. The ratio test states that if the limit as n approaches infinity of the absolute value of the ratio A_(n+1)/A_n is less than 1, the series converges.
For A_n = 30/3^n, we have:
A_(n+1) = 30/3^(n+1)
Now let's find the limit as n approaches infinity of |A_(n+1)/A_n|:
lim(n→∞) |(30/3^(n+1))/(30/3^n)| = lim(n→∞) |(3^n)/(3^(n+1))| = lim(n→∞) |1/3|
Since the limit is 1/3, which is less than 1, the series Σ(A_n) converges.
(b) To determine if the sequence {A_n} is convergent, we need to find the limit as n approaches infinity:
lim(n→∞) (30/3^n)
As n increases, 3^n becomes larger, making the fraction 30/3^n approach zero. Therefore, the sequence {A_n} is convergent, and the limit of convergence is 0.
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