The expected number of unaffected kittens should be 84
Find the below calculation of chi square:
Category Affected Unaffected Total
Observed values 44 84 128
Expected Ratio 1 3 4
Expected Values, E 32 96
Deviation, D 12 -12
Deviation Squared 14 144
D^2/E 4.5 1.5 6
X^2 6
Degrees of freedom - 1
Unaffected number of kittens:
Observed values for Affected=44
Total=128
25% of the 128 are affected.
The unaffected proportion is,
Total-Observed values for Affected kittens
=128-44
=84
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I need help with these. Please explain the work.
A doll shop advertised all dolls priced at a ⅓ discount. What is the sale price
if the doll originally costs $27?
Answer:
18$ with a 1/3 discount applied
Step-by-step explanation:
27 divided by 3=9
27-9=18
Answer:
$18
Step-by-step explanation:
1/3 = ~33.33% off
33.33% of 27 = 9
27-9 = 18
Hope that helps
suppose m<7 = 96 find m<2 and m< 4
Answer:
Answer down below!
Step-by-step explanation:
If we draw this out, we already know that m<7 = 96
Using what we already know, we can figure out the rest
m<6 also equals 96 because m<7 and m<6 are verticle angles
m<3 also equals 96 because m<6 and m<3 are opposite interior angles
m<2 also equals 96 because m<3 and m<2 are verticle angles
Now, to find m<4, simply subtract 96 from 180. That should give you 84
Thus, m<2 = 96 and m<4 = 84
My question is below but I only have 1/2 does anyone know how to get the last mark for 100%
Show that 155 can be expressed as the sum of a power of 2 and a cube number.
128 = 2^7 is a power of 2
27 = 3^3 is a perfect cube
=======================================================
Explanation:
This is something you'd find through trial and error.
The powers of 2 are
2, 4, 8, 16, 32, 64, 128, 256, ...
We double each value to get the next one.
The largest power of 2 that is smaller than 155 is 128
155-128 = 27 which is a cube number since x^3 = 3^3 = 27 as you've shown in the screenshot.
If the result of 155-128 wasn't a perfect cube number, then you'd have to try the next largest power of 2 (which is 64) and work your way down the list.
----------------------
Or you could work with the list of perfect cubes
1, 8, 27, 64, 125, 216, ...
Each value is of the form x^3 where x is a whole number.
Let's pick the largest perfect cube that is under 155, and subtract it
155-125 = 30 which isn't a power of 2 (refer to the list above)
Then try 155-64 = 91 which isn't a power of 2 either
Keep moving down the list until reaching 155-27 = 128 which is a power of 2 since 2^7 = 128
Dean is on in his car and was going 10 m/s but sped up to 100 m/s in 5 seconds. Find his acceleration
Answer:
18 m/s²
Step-by-step explanation:
You want Dean's acceleration when his speed changes from 10 m/s to 100 m/s in 5 seconds.
AccelerationAcceleration is the rate of change of velocity, the change in velocity divided by the corresponding change in time:
a = ∆v/∆t
a = (100 m/s -10 m/s)/(5 s) = (90 m/s)/(5 s) = 18 m/s²
Dean's acceleration is 18 m/s².
__
Additional comment
Both velocity and acceleration are vector quantities. They have both magnitude and direction.
We assume the given speeds are in the same direction, so the direction of the velocity vector does not change. The acceleration is in that same direction.
What are all of the solutions to the trigonometric equation 2 times cosine squared theta minus 2 times sine squared theta equals radical 2 question mark
Explanation
Given the trigonometric expression
[tex]2cos^2\theta-2sin^2\theta=\sqrt{2}[/tex]We can find the solutions below;
From trigonometry identities;
[tex]cos^2\theta-sin^2\theta=cos2\theta[/tex]Therefore; we will have;
[tex]\begin{gathered} 2cos^2\theta-2s\imaginaryI n^2\theta=\sqrt{2} \\ 2(cos^2\theta-sin^2\theta)=\sqrt{2} \\ 2cos2\theta=\sqrt{2} \\ Divide\text{ both sides by 2} \\ \frac{\begin{equation*}2cos2\theta\end{equation*}}{2}=\frac{\sqrt{2}}{2} \\ cos2\theta=\frac{\sqrt{2}}{2} \end{gathered}[/tex]Therefore, the general solutions for the above is given as;
[tex]\begin{gathered} 2θ=\frac{\pi}{4}+2\pi n,\:2θ=\frac{7\pi}{4}+2\pi n \\ therefore; \\ \theta=\frac{\frac{\pi}{4}+2\pi n}{2},\theta=\frac{\frac{7\pi}{4}+2\pi n}{2} \\ \theta=\frac{\pi}{8}=\pi n,\theta=\frac{7\pi}{8}+\pi n \end{gathered}[/tex]Answer:
[tex]\theta=\frac{\pi}{8}+\pi n,\theta=\frac{7\pi}{8}+\pi n[/tex]A waterwheel has a radius of 4 feet, and the center of the wheel is 1 foot under the waterline. You notice a yellow mark at the top of the wheel. If the wheel rotates StartFraction pi Over 3 EndFraction radians, how far above the water is the yellow mark? 1 foot 2 feet 3 feet 4 feet
The height of the yellow mark above the water is 1 foot.
This is further explained below.
How far above the water is the yellow mark?Generally, The radius of a waterwheel is 4 feet, and its center is 1 foot below the waterline.
Estimation of feet:
cos π/3 = OB/OA
1/2 = OB/4
OB = 2
t
In conclusion,A yellow mark should be placed above the water
= OB - OD
= 2 - 1
= 1 foot
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Answer:
the other answer is correct is A. 1 foot
Step-by-step explanation:
Got it right on edge
Nick has 32 nickels and quarters.
The total value of Nick's coins is
$4.60. How many nickels does he
have?
A. 15
B. 16
c. 17
D. 18
how do you know if the mapping is a function
Answer:
Suppose every object in the domain has only one image in the codomain, then the mapping is a function. Otherwise, it is not a functions
Looking at the given mapping:
-2 is mapped to both 1 and 3
0 is mapped to -3
1 is mapped to 4
3 is mapped to 1
Because -2 has more than one image, it disqualifies the mapping from being a function.
find the two positive integers whose product is 24,999,999 and whose positive difference is as small as positive. Explain how you discovered them.
Two positive integers whose product is 24,999,999 are 4999 and 5001
Given
The product of two numbers should be 24,999,999.
The positive difference should be small
There are many ways to obtain those two numbers but an easiest way would be taking the square root of the given number and making decision by trial and error.
This may take few iterations but this is the optimal way to solve.
Square root of 24,999,999 is 4999.99
Hence try multiplying a number less than and a number equal to 4999.99.
Eventually we will reach to a conclusion 4999 x 5001 whose product is 24,999,999.
The difference of the numbers is 5001 - 4999 = 2
Hence the positive difference is small.
Hence the two numbers are 4999, 5001.
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In the figure below, PQ = 18 and PR = 31. Find QR.POROR =X
Looking at the diagram, PQ = 18 and PR = 31
We can see that
PQ + QR = PR
Therefore,
18 + QR = 31
QR = 31 - 18
QR = 13
The population of a colony of mosquitoes obeys the law of uninhibited growth. If there are 1000 mosquitoes initially and there are 1600 after 1 day, what is the size of the colony after 4 days? How long is it until there are 70,000 mosquitoes?
The number of mosquitoes on the colony after 4 days is 2800.
The number of days that there are 70,000 mosquitoes will be 114 dad.
How to illustrate the population?The population of a colony of mosquitoes obeys the law of uninhibited growth and there are 1000 mosquitoes initially and there are 1600 after 1 day. The common difference will be:
= 1600 - 1000
= 600
The formula for the arithmetic sequence will be:
= a + (n - 1)d
a = 1000
d = 600
n = 4
The colony after 4 days will be:
= a + (n - 1)d
= 1000 + (4 - 1)600
= 1000 + 1800
= 2800
The number of days that there are 70,000 mosquitoes will be:
a + (n - 1)d = 70000
1000 + 600(n - 1) = 70000
1000 + 600n - 600 = 70000
Collect like terms
600n = 70000 - 1000 + 600
600n = 68400
n = 68400/600
n = 114 days
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What is the surface area?
in
- 5 in
Answer:
94 ft
Step-by-step explanation:
standard form: all exponets are ___________numbers & it is written in __________ order -5x^7+4x^2+3x-2
Gabriel tiene el doble de dinero que Daniel y tiene cinco veces lo que Edgar. Si Gabriel regalara Q14 a Daniel y Q33 a Edgar, los tres quedarían con igual cantidad. ¿Cuánto dinero tiene cada uno?
Using a system of equations, it is found that the amounts of money that each of Gabriel, Daniel and Edgar have are given as follows:
Gabriel: Q122.Daniel: Q61.Edgar: Q42.What is a system of equations?A system of equations is when multiple variables are related, and equations are built to find the numeric values of each variable, according to the relations built in the context of the problem.
In the context of this problem, the variables are given as follows:
Variable x: Amount of money that Gabriel has.Variable y: Amount of money that Daniel has.Variable z: Amount of money that Edgar has.Gabriel has double the amount of Daniel, hence:
x = 2y.
Gabriel has five times the amount of Edgar, hence:
x = 5z.
If Gabriel loans Q14 to Daniel and Q33 to Edgar, they will have the same amount, hence:
x - 47 = y + 14 = z + 33.
Since x = 2y, we can replace into the first two sides of the equality above and solve for y as follows:
2y - 47 = y + 14
y = 61. (Daniel's amount).
The solution for x is given as follows:
x = 2y = 2(161) = 122 (Gabriel's amount).
The solution for z is given as follows:
x - 47 = z + 33
122 - 47 = z + 33
75 = z + 33
z = 75 - 33
z = 42 (Edgar's amount).
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Maple has 4 identical loaves of bread that weigh a total of 6.6 pounds. How much does 1 loaf of bread weigh?
Answer:
1.65
Step-by-step explanation:
Divide 6.6 by 4
An elementary school wants to purchase a new swing set. The table shows the selling price of the swing sets they are interested in buying.
Swing Set Wholesale Price ($)
Adventurers 3,056
Thunder Ridge 4,125
The markup for both swing sets is
20
1
4
%
. The school decides to buy the Adventurers swing set. What is the selling price of the swing set they are buying? Round to the nearest cent if necessary.
The selling price of the adventurers swing set given the wholesale price and the mark-up price is $3,674.84.
What is the selling price?The selling price of the adventurers swing set is the sum of the wholesale price and the percentage mark-up. Mark-up is the rate at which the selling price of an item is increased.
Percentage is the rate of an amount expressed as a number out of hundred. The sign that is used to represent percentages is %.
Selling price = wholesale price x (1 + mark-up price)
3,056 x (1 + 0.2025)
3056 x 1.2025 = $3,674.84
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Graph the following set of points: A B C (1,3), (-3, -3), (5,2). Find the area and perimeter of ∆ABC . Leave answer in two decimal places.
The perimeter of the triangle is 29.31 units and the area of the triangle is 38.87 units^2
Distance Between Points
To find the perimeter and area of the triangle, we have to use the formula of distance between two points.
A = (1, 3)B = (-3, -3)C = (5, 2)Distance between AB
[tex]d_a_b = \sqrt{(a_1+a_2)^2 + (b_1 + b_2)^2} \\d_a_b = \sqrt{(3+1)^2 + (-3-3)^2}\\ d_a_b = \sqrt{4^2 + 9^2} \\d_a_b = 9.85 units[/tex]
Distance between BC
[tex]d_b_c = \sqrt{(b_1+b_2)^2 + (c_1+c_2)^2}\\d_b_c = \sqrt{(-9)^2 + (7)^2}\\d_b_c = \sqrt{130} \\d_b_c = 11.40 units[/tex]
Distance between AC
[tex]d_a_c = \sqrt{(a+1_a_2)^2 + (c_1+c_2)^2} \\d_a_c = 8.06 units[/tex]
The perimeter of the triangle is equal to
[tex]p = 9.85 + 11.40 + 8.06 = 29.31 units[/tex]
The area of the triangle is 38.87 units^2
Kindly find the attached graph below;
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Fully factorise x² + 7x+6
just find the roots and substitute
a(x - "first root") (x - "second root")
Raymond bought a handbag marked down from $50 to $45. What is the discount, as a percentage?
Answer: 10%
Step-by-step explanation:
First, we will find the amount that was saved from the markdown.
$50 - $45 = $5
Next, we will find what percent this is of $50.
$5 / $50 = 0.1 ➜ 10%
The discount, as a percentage, is 10%.
Write an equation of the line in point-slope form that passes through the given points.
(3,4) and (4,7)
Answer:
y - 4 = 3(x - 3) or y - 7 = 3(x - 4)
Step-by-step explanation:
y1 = mx1 + b
y2 = mx2 + b
(3, 4) = (x1, y1)
(4, 7) = (x2, y2)
4 = 3m + b
7 = 4m + b
-3 = -m
m = 3
y - y1 = m(x - x1)
y - 4 = 3(x - 3)
A tree branch is observed to bend as the fruit growing on it increase in size. By estimating the mass of the developing fruit and plotting the data over time, a student finds that the height h in metres of the branch end above the ground is closely approximated by the function h=2-0.2×1.60.2m where m is the estimated mass, in kilograms, of fruit on the branch.
(a) Sketch the graph of h against m.
The graph of h against m is plotted in form of a curve.
Given:
A tree branch is observed to bend as the fruit growing on it increases in size.
The height h in metres of the branch end above the ground is closely approximated by the function [tex]h=2-0.2*1.60^{0.2m}[/tex] where m is the estimated mass, in kilograms, of fruit on the branch.
We have to sketch the graph of h against m.
The x-axis represents the mass in kg while the y-axis represents the height of the branch above the ground in metres.
Hence a curved graph is obtained by plotting the function.
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-2
What is the Domain:
What is the Range:
Answer:
The set of all the first element of the ordered pairs of R is called domain and the set of all the second element of the ordered pairs of R is called range .
Make r the subject of the formula t= r/r-3
Answer:
r = 3t/t-1
Step-by-step explanation:
t = r/r-3
1. times both sides by r-3
t(r-3) = r
= tr - 3t = r
2. add 3t to both sides
tr = 3t + r
3. minus r
tr - r = 3t
4. factorise out r
r(t-1)=3t
5. divide by t-1
r = 3t/t-1
Simplify the expression (2 − 5)(3 + 7) − (4 + 3) and please be sure to explain your steps!
Answer: - 37
Step-by-step explanation:
so (2-5)(3+7) - (4+3) start off by the right side really doesn't matter what side you start on, but I added 4+3=7
x= (2-5)(10) - (7) Then add 3+7=10
x= (-3)(10) - (7) 3rd subtract 2-5=-3
x= -30 - 7 Next multiply -3*10=-30 because two numbers together with parenthesis means multiplication.
x= -37 Lastly subtract -30 - 7 and I got -37
Explain how to use a graph of the function f(x) to
find f(3).
By focusing on x- axis we can get value of f(3).
What is function?In mathematics, a function is represented as a rule that produces a distinct result for each input x. In mathematics, a function is indicated by a mapping or transformation. Typically, these functions are identified by letters like f, g, and h. The collection of all the values that the function may input while it is defined is known as the domain. The entire set of values that the function's output can produce is referred to as the range. The set of values that could be a function's outputs is known as the co-domain.
Given:
We have a function f(x).
Now, we have to find the value of f(3) from the graph
So, If we had the graph of f(x) and wanted to find f(3), we would look for the location on the graph where x = 3, then determine its y-value.
The response to f(3) is that y-value.
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The area of a circle is 9π cm². What is the circumference, in centimeters? Express your answer in terms of
π
The circumference of a circle whose area is 9π cm² in terms of pi is 6π centimeters.
What is the circumference of the circle?A circle is simply a closed 2-dimensional curved shape with no corners or edges.
The area of a circle is expressed mathematically as;
A = πr²
The circumference of a circle is expressed mathematically as;
C = 2πr
Given that the area of the circle is 9πcm², we determine the radius of the circle.
A = πr²
9πcm² = π × r²
r² = 9πcm² / π
r² = 9cm²
r = √9cm²
r = 3cm
Now, we determine the circumference of the circle.
C = 2πr
C = 2 × π × 3cm
C = 6cm × π
C = 6π cm
Therefore, the circumference of the circle is 6π centimeters.
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Rewrite the equation in the form (x − p)² = q.
x^2 + 5x + 9/4=0
Answer:
Step-by-step explanation:
STEP
1
:
9
Simplify —
4
Equation at the end of step
1
:
9
((x2) - 5x) - (0 - —) = 0
4
STEP
2
:
Rewriting the whole as an Equivalent Fraction
2.1 Subtracting a fraction from a whole
Rewrite the whole as a fraction using 4 as the denominator :
x2 - 5x (x2 - 5x) • 4
x2 - 5x = ——————— = —————————————
1 4
Equivalent fraction : The fraction thus generated looks different but has the same value as the whole
Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator
STEP
3
:
Pulling out like terms
3.1 Pull out like factors :
x2 - 5x = x • (x - 5)
Adding fractions that have a common denominator :
3.2 Adding up the two equivalent fractions
Add the two equivalent fractions which now have a common denominator
Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:
x • (x-5) • 4 - (-9) 4x2 - 20x + 9
———————————————————— = —————————————
4 4
Trying to factor by splitting the middle term
3.3 Factoring 4x2 - 20x + 9
The first term is, 4x2 its coefficient is 4 .
The middle term is, -20x its coefficient is -20 .
The last term, "the constant", is +9
Step-1 : Multiply the coefficient of the first term by the constant 4 • 9 = 36
Step-2 : Find two factors of 36 whose sum equals the coefficient of the middle term, which is -20 .
-36 + -1 = -37
-18 + -2 = -20 That's it
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -18 and -2
4x2 - 18x - 2x - 9
Step-4 : Add up the first 2 terms, pulling out like factors :
2x • (2x-9)
Add up the last 2 terms, pulling out common factors :
1 • (2x-9)
Step-5 : Add up the four terms of step 4 :
(2x-1) • (2x-9)
Which is the desired factorization
Equation at the end of step
3
:
(2x - 9) • (2x - 1)
——————————————————— = 0
4
STEP
4
:
When a fraction equals zero :
4.1 When a fraction equals zero ...
Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.
Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.
Here's how:
(2x-9)•(2x-1)
————————————— • 4 = 0 • 4
4
Now, on the left hand side, the 4 cancels out the denominator, while, on the right hand side, zero times anything is still zero.
The equation now takes the shape :
(2x-9) • (2x-1) = 0
Theory - Roots of a product :
4.2 A product of several terms equals zero.
When a product of two or more terms equals zero, then at least one of the terms must be zero.
We shall now solve each term = 0 separately
In other words, we are going to solve as many equations as there are terms in the product
Any solution of term = 0 solves product = 0 as well.
Solving a Single Variable Equation:
4.3 Solve : 2x-9 = 0
Add 9 to both sides of the equation :
2x = 9
Divide both sides of the equation by 2:
x = 9/2 = 4.500
Solving a Single Variable Equation:
4.4 Solve : 2x-1 = 0
Add 1 to both sides of the equation :
2x = 1
Divide both sides of the equation by 2:
x = 1/2 = 0.500
Supplement : Solving Quadratic Equation Directly
Solving 4x2-20x+9 = 0 directly
Earlier we factored this polynomial by splitting the middle term. let us now solve the equation by Completing The Square and by using the Quadratic Formula
Parabola, Finding the Vertex:
5.1 Find the Vertex of y = 4x2-20x+9
Parabolas have a highest or a lowest point called the Vertex . Our parabola opens up and accordingly has a lowest point (AKA absolute minimum) . We know this even before plotting "y" because the coefficient of the first term, 4 , is positive (greater than zero).
Each parabola has a vertical line of symmetry that passes through its vertex. Because of this symmetry, the line of symmetry would, for example, pass through the midpoint of the two x -intercepts (roots or solutions) of the parabola. That is, if the parabola has indeed two real solutions.
Parabolas can model many real life situations, such as the height above ground, of an object thrown upward, after some period of time. The vertex of the parabola can provide us with information, such as the maximum height that object, thrown upwards, can reach. For this reason we want to be able to find the coordinates of the vertex.
For any parabola,Ax2+Bx+C,the x -coordinate of the vertex is given by -B/(2A) . In our case the x coordinate is 2.5000
Plugging into the parabola formula 2.5000 for x we can calculate the y -coordinate :
y = 4.0 * 2.50 * 2.50 - 20.0 * 2.50 + 9.0
or y = -16.000
Parabola, Graphing Vertex and X-Intercepts :
Root plot for : y = 4x2-20x+9
Axis of Symmetry (dashed) {x}={ 2.50}
Vertex at {x,y} = { 2.50,-16.00}
x -Intercepts (Roots) :
Root 1 at {x,y} = { 0.50, 0.00}
Root 2 at {x,y} = { 4.50, 0.00}
Write the equation of the line in fully simplified slope-intercept form.
Answer:
y = -x + 6
Step-by-step explanation:
Slope-intercept is the y = mx + b form, in which m is the slope, and b is the y-intercept.
From the graph provided, we can see that the line intercepts the y axis when the y-coordinate is 6, so we can use 6 as "b" in the equation.y₂
The slope can be found by picking two points on the graph, calling the first point (x₁, y₁) and the second point (x₂, y₂), and applying the formula slope = (y₂ - y₁) ÷ (x₂ - x₁).
Now, we pick two points - I'm choosing (1, 5) and (2, 4) - and apply the formula.
(4 - 5) ÷ (2 - 1) = -1/1 = -1
Therefore, we know our slope is -1
Putting this all together, we get y = -1x + 6, which we can simplify to y = -x + 6 (since -1 * x is the same as -x)
1 What is the domain of the linear function
graphed below?
Answer:
Step-by-step explanation:
The domain of a function is the set of all possible inputs for the function - so all possible x values in some f(x) functions.
From the graph, you can see that the values on the x-axis below the graph are in the range -4 (exclusive) and 2 (inclusive) that's why the range is
-4 < x <=2, or simply (-4,2>