which angle measure is coterminal with the angle 7pi/12? a. 15 degrees b. 125 degrees c. 285 degrees d. 465 degress

The correct answer is (c) 0. The mean of the t-distribution is always 0.

The t-distribution is a probability distribution that is used to test hypotheses about the population mean when the sample size is small and the population standard deviation is unknown. The shape of the t-distribution depends on the degrees of freedom (df), which is equal to the sample size minus one.

Although the t-distribution changes shape as the degrees of freedom change, the center of the distribution is always at zero. Therefore, the mean of the t-distribution is always zero, regardless of the degrees of freedom or any other factors.

Therefore, the correct answer is (c) 0.

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Answer:

a) Yes No Total

Students 30 15 45

Teachers 20 10 30

Total 50 25 75

b) 30/75 = 2/5 = 40% of the people surveyed were teachers.

c) 20/75 = 4/15 = 26.7% of the people surveyed were teachers who wanted a later start time.

Answer:

40%

Step-by-step explanation:

boys can cycle = 49- 22 = 27

total boys = 27+ 41  = 68

% can cycle = 27/ 68 = 40%

Each group of four binary digits can be represented by a single hexadecimal digit. The hexadecimal notation of (0111 0111 0111 0111)₂ is (7777)₁₆.

To convert the binary expansion of (0111 0111 0111 0111)2 to hexadecimal, we first group the digits into groups of four starting from the right:
(0111 0111 0111 0111)2 = (7 7 7 7)16
Each group of four binary digits can be represented by a single hexadecimal digit. In this case, each group of four binary digits represents the hexadecimal digit 7. Therefore, the hexadecimal notation of (0111 0111 0111 0111)2 is (7777)16.
To convert the binary expansion (0111 0111 0111 0111)₂ to a hexadecimal expansion, you can group the binary digits into sets of four starting from the right and then convert each group to its corresponding hexadecimal value. Here's the process:
1. Group the binary digits: (0111) (0111) (0111) (0111)
2. Convert each group to hexadecimal:
  - (0111)₂ = 7₁₆
  - (0111)₂ = 7₁₆
  - (0111)₂ = 7₁₆
  - (0111)₂ = 7₁₆
Your answer: The hexadecimal notation of (0111 0111 0111 0111)₂ is (7777)₁₆.

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The upper bound for r(3,3,3,3) is greater than 27

To find an upper bound for r(3, 3, 3, 3), we can use the result from problem 20, which states that r(3,3,3) <= 17. This means that the maximum number of non-collinear points that can be placed on a 3x3x3 grid is 17.

Since r(3,3,3,3) represents the minimum number of points needed to guarantee that there is a set of four points that form a unit distance apart, we can use this upper bound of 17 for r(3,3,3) to find an upper bound for r(3,3,3,3).

One way to approach this is to consider the number of points that can be placed on a 3x3x3 cube such that no four points form a unit distance apart. We can start by placing a point at the center of the cube and then placing points at each of the 26 vertices. This gives us a total of 27 points.

However, we need to eliminate any sets of four points that form a unit distance apart. To do this, we can consider each of the 27 points in turn and eliminate any sets of three points that form an equilateral triangle with the given point. This will ensure that there are no sets of four points that form a unit distance apart.

Using this approach, we can see that the maximum number of points that can be placed on a 3x3x3x3 grid such that no four points form a unit distance apart is less than or equal to 27 - (3 * 12) = 27 - 36 = -9.

Since this is not a meaningful result, we can conclude that the upper bound for r(3,3,3,3) is greater than 27. However, we cannot determine a more precise upper bound without further analysis.

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The function y in the differential equation y‴−13y″+40y′=56eˣ, y(0)=20, y′(0)=19, y″(0)=10 as a function of x is: y(x) = -18 + e⁵ˣ + (9/32)e⁸ˣ + 2eˣ.

To solve this problem, we need to find the general solution to the differential equation y‴−13y″+40y′=56eˣ and then use the initial conditions to find the particular solution.

First, we find the characteristic equation:

r³ - 13r² + 40r = 0

Factorizing it, we get:

r(r² - 13r + 40) = 0

Solving for the roots, we get:

r = 0, 5, 8

So the general solution is:

y_h(x) = c1 + c2e⁵ˣ + c3e⁸ˣ

To find the particular solution, we can use the method of undetermined coefficients. Since the right-hand side of the differential equation is of the form keˣ, where k = 56, we assume a particular solution of the form:

y_p(x) = Aeˣ

Taking the first three derivatives:

y′_p(x) = Aeˣ

y″_p(x) = Aeˣ

y‴_p(x) = Aeˣ

Substituting these into the differential equation, we get:

Aeˣ - 13Aeˣ + 40Aeˣ = 56eˣ

Simplifying, we get:

28Aeˣ = 56eˣ

So A = 2. Substituting this value back into y_p(x), we get:

y_p(x) = 2eˣ

Therefore, the general solution is:

y(x) = y_h(x) + y_p(x)

= c1 + c2e⁵ˣ + c3e⁸ˣ + 2eˣ

Finding the values of the constants c1, c2, and c3:

y(0) = c1 + c2 + c3 + 2 = 20

y′(0) = 5c2 + 8c3 + 2 = 19

y″(0) = 25c2 + 64c3 = 10

Solving these equations simultaneously, we get:

c1 = -18

c2 = 1

c3 = 9/32

Therefore, the particular solution is:

y(x) = -18 + e⁵ˣ + (9/32)e⁸ˣ + 2eˣ

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Answer:

LO=6

Step-by-step explanation:

MO/KO=NO/LO

5/10=3/LO

5LO=30

LO=6cm

Answer:

2 1/3

Step-by-step explanation:

V = LWH

V = 1 3/4 ft × 2/3 ft × 2 ft

V = 7/4 × 2/3 × 2/1 ft³

V = 28/12 ft³

V = 7/3 ft³

V = 2 1/3 ft³

Answer:

The distance the players must run is [tex]150 m[/tex]

Step-by-step explanation:

The distance that the players must run diagonally from one corner of the soccer field to the inverse corner can be found by using the Pythagorean hypothesis,

The Pythagorean hypothesis may be a scientific guideline that relates to the sides of a right triangle. It states that the square of the length of the hypotenuse (the longest side of the triangle) is break even with to the whole of the squares of the lengths of the other two sides.  

The length of the soccer field is 120 m long.(given)

The width of the soccer field is 90 m (given)

and width of the soccer field shape the two legs of the right triangle, and the corner-to-corner distance is the hypotenuse. Hence, we can utilize the Pythagorean theorem as takes after:

Distance = [tex]\sqrt{(length^{2} } + width^{2}[/tex]

                [tex]= \sqrt{120^{2} + 90^{2} }[/tex]

                = ([tex]\sqrt{(14400 + 8100)}[/tex]

                = [tex]\sqrt{22500}[/tex]

                 [tex]= 150.00 meters[/tex]

Therefore, the distance the players must run is 150. m

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The equation 4 = a1 + b2 + c*3. Therefore, 4 cannot be written as a linear combination of {1, 2, 3}.

4 cannot be written as a linear combination of {1, 2, 3}. To show this, we can assume the opposite and try to find coefficients that satisfy the equation 4 = a1 + b2 + c*3, where a, b, and c are constants.

Subtracting 2 from both sides, we get:

2 = a*(-1) + b0 + c1

This is a system of two equations with three variables, which does not have a unique solution. We can solve for one of the variables in terms of the other two, for example:

a = 2 - c

b = any value

c = any value

This means that there are infinitely many solutions, and we cannot find a unique combination of a, b, and c that satisfies the equation 4 = a1 + b2 + c*3. Therefore, 4 cannot be written as a linear combination of {1, 2, 3}.

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The 95% confidence interval for the population mean difference is (10.05, 11.15).

To test the hypothesis H0:

μd = 7 versus Ha: μd ≠ 7,

we can use a two-tailed t-test for the paired differences with a significance level of α = 0.05. The test statistic is calculated as:

t = (bd - μd) / (sd/√(n))

where bd is the sample mean of the differences, μd is the hypothesized population mean, sd is the sample standard deviation of the differences, and n is the sample size.

From the given information:

n = 50

∑xd = 530

∑xd2 = 7,400

We can calculate:

bd = (∑xd) / n = 530 / 50 = 10.6

s²d = (∑xd2 - (∑xd)² / n) / (n - 1)

      = (7,400 - (530)² / 50) / 49

      = 3.6327

sd = √(s^2d) = √(3.6327) = 1.9054

μd = 7

Then, the test statistic is:

t = (bd - μd) / (sd /√(n)) = (10.6 - 7) / (1.9054 /√(50)) = 6.798

Using a t-distribution table with 49 degrees of freedom and a two-tailed test at α = 0.05,

we find the critical values to be ±2.0096.

Since the calculated t-value (6.798) is greater than the absolute value of the critical value (2.0096), we reject the null hypothesis and conclude that there is sufficient evidence to suggest that the mean difference is not equal to 7.

The p-value is the probability of observing a t-value as extreme as the one calculated (or even more extreme) if the null hypothesis is true. We can find the p-value using a t-distribution table or calculator.

With a t-value of 6.798 and 49 degrees of freedom, the p-value is less than 0.0001 (or 0.0000 rounded to four decimal places). This means that there is an extremely small probability of observing such a large t-value by chance alone, assuming that the null hypothesis is true.

Construct a 95% confidence interval for the population mean difference. (Round to two decimal places as needed.)

The 95% confidence interval can be calculated using the formula:

bd ± tα/2 * (sd /√(n))

where tα/2 is the t-value that corresponds to the desired level of confidence (0.95) and the degrees of freedom (49).

From the t-distribution table, we find tα/2 = 2.0096.

Substituting the values:

bd = 10.6

sd = 1.9054

n = 50

tα/2 = 2.0096

We get:

10.6 ± 2.0096 * (1.9054 /√(50))

= 10.6 ± 0.5456

The population mean difference has a 95% confidence range of (10.05, 11.15) (rounded to two decimal places).


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The 95% confidence interval for the population mean difference is (10.05, 11.15).

To test the hypothesis H0:

μd = 7 versus Ha: μd ≠ 7,

we can use a two-tailed t-test for the paired differences with a significance level of α = 0.05. The test statistic is calculated as:

t = (bd - μd) / (sd/√(n))

where bd is the sample mean of the differences, μd is the hypothesized population mean, sd is the sample standard deviation of the differences, and n is the sample size.

From the given information:

n = 50

∑xd = 530

∑xd2 = 7,400

We can calculate:

bd = (∑xd) / n = 530 / 50 = 10.6

s²d = (∑xd2 - (∑xd)² / n) / (n - 1)

      = (7,400 - (530)² / 50) / 49

      = 3.6327

sd = √(s^2d) = √(3.6327) = 1.9054

μd = 7

Then, the test statistic is:

t = (bd - μd) / (sd /√(n)) = (10.6 - 7) / (1.9054 /√(50)) = 6.798

Using a t-distribution table with 49 degrees of freedom and a two-tailed test at α = 0.05,

we find the critical values to be ±2.0096.

Since the calculated t-value (6.798) is greater than the absolute value of the critical value (2.0096), we reject the null hypothesis and conclude that there is sufficient evidence to suggest that the mean difference is not equal to 7.

The p-value is the probability of observing a t-value as extreme as the one calculated (or even more extreme) if the null hypothesis is true. We can find the p-value using a t-distribution table or calculator.

With a t-value of 6.798 and 49 degrees of freedom, the p-value is less than 0.0001 (or 0.0000 rounded to four decimal places). This means that there is an extremely small probability of observing such a large t-value by chance alone, assuming that the null hypothesis is true.

Construct a 95% confidence interval for the population mean difference. (Round to two decimal places as needed.)

The 95% confidence interval can be calculated using the formula:

bd ± tα/2 * (sd /√(n))

where tα/2 is the t-value that corresponds to the desired level of confidence (0.95) and the degrees of freedom (49).

From the t-distribution table, we find tα/2 = 2.0096.

Substituting the values:

bd = 10.6

sd = 1.9054

n = 50

tα/2 = 2.0096

We get:

10.6 ± 2.0096 * (1.9054 /√(50))

= 10.6 ± 0.5456

The population mean difference has a 95% confidence range of (10.05, 11.15) (rounded to two decimal places).


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For any integer n, [tex]n^2[/tex] is congruent to 0 or 1 mod 4. This statement is true.

Let's first consider the possible remainders of an integer when divided by 4. There are four possibilities: 0, 1, 2, or 3.

If we square any integer, we get an even number if the original integer is even (i.e., has remainder 0 or 2 when divided by 4), and we get an odd number if the original integer is odd (i.e., has remainder 1 or 3 when divided by 4).

Now, let's consider the possible remainders of [tex]n^2[/tex] when divided by 4:

If n has remainder 0 when divided by 4 (i.e., n is even), then [tex]n^2[/tex] has remainder 0 when divided by 4, since the square of any even number is divisible by 4. So,[tex]n^2[/tex] is congruent to 0 mod 4.

If n has remainder 1 when divided by 4 (i.e., n is odd), then [tex]n^2[/tex] has remainder 1 when divided by 4, since the square of any odd number leaves a remainder of 1 when divided by 4. So, [tex]n^2[/tex] is congruent to 1 mod 4.

If n has remainder 2 when divided by 4 (i.e., n is even), then [tex]n^2[/tex] has remainder 0 when divided by 4, since the square of any even number is divisible by 4. So, [tex]n^2[/tex] is congruent to 0 mod 4.

If n has remainder 3 when divided by 4 (i.e., n is odd), then [tex]n^2[/tex] has remainder 1 when divided by 4, since the square of any odd number leaves a remainder of 1 when divided by 4. So, [tex]n^2[/tex] is congruent to 1 mod 4.

Therefore, we have shown that for any integer n, [tex]n^2[/tex] is congruent to 0 or 1 mod 4.

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Triangle DEF is not congruent to triangle ABC

Yes, triangle GHI is congruent to triangle ABC the reason is SAS

The Angle-Side-Angle (ASA) theorem is a geometry mathematical principle that establishes the congruence of triangles.

More specifically, this theorem notes that if two angles and their included side on one triangle are equal in measure to the corresponding two angles and included side on another triangle, then both triangles are said to be congruent.

Since ASA relies heavily upon the matching of angle size and side length, it serves as an essential tool for geometric proofs and thorough analyses.

The corresponding angles are

52.4 and 45.5

The included side is 5cm

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The area of the triangle is 5 square units. None of the given options match our answer, so there may be an error in the question or the answer choices.

To determine the area of a triangle with vertices defined by the given points A(2,1), B(3,6), and C(6,2), we can use the formula for the area of a triangle:

Area = 1/2 * base * height

where the base is the distance between two vertices and the height is the perpendicular distance from the third vertex to the base. We can choose any two vertices as the base, so let's choose AB as the base.

The distance between A and B is:

√((3-2)^2 + (6-1)^2) = √(26)

To find the height, we need to find the equation of the line passing through C and perpendicular to AB. The slope of AB is (6-1)/(3-2) = 5, so the slope of the perpendicular line is -1/5. We can use the point-slope form to find the equation of the line:

y - 2 = (-1/5)(x - 6)
y = (-1/5)x + (32/5)

To find the height, we need to find the distance from point A to this line. We can use the formula for the distance from a point to a line:

distance = |Ax + By + C| / √(A² + B²)

where A, B, and C are the coefficients of the line in the standard form Ax + By + C = 0. Plugging in the values, we get:

distance = |2*(-1/5) + 1*1 + (32/5)| / √((-1/5)² + 1²)
distance = 10/√(26)

Now we can plug in the values into the formula for the area:

Area = 1/2 * √(26) * (10/√(26))
Area = 5

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(a) f = 5xyz + 5x^2y/2 + C is a potential function for F.

(b) f = ye^(xz) + 9x^2y/2e^(xz) + C is a potential function for F.

To find a potential function f for a conservative vector field F, we need to find a scalar function f(x, y, z) such that the gradient of f is equal to F, i.e., ∇f = F.

(1) For F = 5yzi + 5xzj + 5xyk, we need to find f such that ∂f/∂x = 5yz, ∂f/∂y = 5xz, and ∂f/∂z = 5xy.

Integrating the first equation with respect to x gives f = 5xyz + g(y, z), where;

Differentiating this expression with respect to y and z and comparing with the other two equations, we find that;

g(y, z) = C + 5x^2y/2 and

f = 5xyz + 5x^2y/2 + C,

where;

Therefore, f = 5xyz + 5x^2y/2 + C is a potential function for F.

(2) For F = 9yze^(xz)i + 9exzj + 9xye^(xz)k, we need to find f such that;

Integrating the first equation with respect to x gives f = ye^(xz) + g(y, z),.

where;

Differentiating this expression with respect to y and z and comparing with the other two equations, we find that;

g(y, z) = C + 9x^2ye^(xz)/2 and

f = ye^(xz) + 9x^2y/2e^(xz) + C,

where;

Therefore, f = ye^(xz) + 9x^2y/2e^(xz) + C is a potential function for F.

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Answer: 5

Step-by-step explanation:

Explanation in image

The measure of x using the circle property is 5 degree.

Given:

<A = 17x - 23

As, sum of all parts or angles in a circle is equal to 360 degrees

So, 81 + 74 + x = 360

x + 155 = 360

x = 360- 155

x = 205 degree

Now, using the formula

angle A = Far arc- near arc / 2

17x - 23 = (205 - 81) /2

17x - 23 = 62

17x = 62 + 23

17x = 85

Divide both side by 17

x= 5

Thus, the value of x is 5.

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In the given diagram, the area of the shape is approximately 35.7 mm²

From the question, we are to calculate the area of the shape.

From the given information, we have a trapezium and a semicircle cut out of it

The area of the shape = Area of the trapezium - Area of the semicircle

Area of a trapezium = 1/2(a + b) × h

Where a and b are the parallel sides

and h is the perpendicular height

Area of a semicircle = 1/2 πr²

Where r is the radius

Thus,

Area of the shape = [1/2(a + b) × h] - [1/2 πr²]

In the given diagram,

a = 10 mm

b = 15 mm

h = 6 mm

r = 10 / 2 mm = 5 mm

Substituting the parameters, we get

Area of the shape = [1/2(10 + 15) × 6] - [1/2 π(5)²]

Area of the shape = 75 - 39.2699 mm²

Area of the shape = 35.7301mm²

Area of the shape ≈ 35.7 mm²

Hence,

The area is 35.7 mm²

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The single transformation which this student performed include the following: a reflection over the y-axis.

In Geometry, a reflection over or across the y-axis or line x = 0 is represented and modeled by this transformation rule (x, y) → (-x, y).

By applying a reflection over the y-axis to the coordinate of the given triangle PQR, we have the following coordinates:

(x, y)                             →                 (-x, y).

Coordinate P = (-1, 1)   →  Coordinate J' = (-(-1), 1) = (1, 1).

Coordinate Q = (-4, 1)   →  Coordinate K' = (-(-4), 1) = (4, 1).

Coordinate R = (-4, 4)   →  Coordinate L' = (-(-4), 4) = (4, 4).

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The quadratic value equation with zeroes at -11 is f(x) = a(x + 11)²

Given data ,

A quadratic function that has -11 as its only zero can be written in the form:

f(x) = a(x - r)²

where "a" is a non-zero constant and "r" is the zero of the function, in this case, -11.

On simplifying the equation , we get

f(x) = a(x - (-11))²

f(x) = a(x + 11)²

Hence , any quadratic function of the form f(x) = a(x + 11)^2, where "a" is a non-zero constant, will have -11 as its only zero

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The statement is false because in exponential growth, the time required to increase by a factor of 10 actually increases as the quantity gets larger.

We have,

In exponential growth, the rate of increase becomes progressively faster as the quantity grows.

This means that the time it takes to increase by a factor of 10 will also increase. For example, if it takes 1 year to increase from 1 to 10, it may take 2 years to increase from 10 to 100, and 3 years to increase from 100 to 1000.

The time required to achieve a factor of 10 increase will depend on the specific growth rate and initial quantity.

Therefore,

The time required to increase by a factor of 10 does not remain constant for all time in exponential growth. It increases as the quantity grows larger.

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Answer:

Step-by-step explanation:

ANSWER

480 cm^2

Step-by-step explanation:

divide it into 3 blocks

The circle that contains the point (-2, 8) and has a center at (4, 0) is given by the equation (x - 4)² + y² = 100

The standard form equation of a circle with center (h, k) and radius r is:

(x - h)² + (y - k)² = r²

Given that: the circle that contains the point (-2, 8) and has a center at (4, 0).

The distance between the center of a circle and any point on the circle is constant and is called the radius of the circle.

TherHence, to find the circle that contains the point (-2, 8) and has a center at (4, 0), we need to find the distance between these two points and use that as the radius of the circle.

The distance between two points (x1, y1) and (x2, y2) is given by the distance formula:

d = √((x2 - x1)² + (y2 - y1)²)

d = √((4 - (-2))² + (0 - 8)²)

= √(6² + (-8)²)

= √(100)

= 10

Hence, the distance between the center of the circle at (4, 0) and the point (-2, 8) is 10 units.

Therefore, the radius of the circle is 10 units.

The equation of a circle with center (h,k) and radius r is given by:

(x - h)² + (y - k)² = r²

In this case, the center is (4, 0) and the radius is 10, so the equation of the circle is:

(x - 4)² + y² = 10²

(x - 4)² + y² = 100

Therefore, the equation of the circle is (x - 4)² + y² = 100.

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In conclusion, each yi (i = 1, ..., n) has a Poisson distribution with mean μ, and their PMFs follow the below expression.

Hi! The given terms are y1, ..., yn, which are independent Poisson random variables each with mean μ. To determine the distribution for y1, ..., yn, we consider their properties.

Since y1, ..., yn are independent Poisson random variables, each of them follows a Poisson distribution with the same mean μ. The probability mass function (PMF) for each yi (where i = 1, ..., n) can be expressed as:

[tex]P(y_i = k) = (e^{-u} * \frac{(u^k))} { k!} , for k = 0, 1, 2, ...[/tex]

Here, e is the base of the natural logarithm, and k! denotes the factorial of k.

In conclusion, each yi (i = 1, ..., n) has a Poisson distribution with mean μ, and their PMFs follow the above expression.

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Answer:

Step-by-step explanation:

It is a right triangle.

Pythagorean Theorem can be used to find the sides.

IF the square of one side of a triangle is equal to the sum of the squares of the other two sides, then the triangle is a right triangle.  The right angle is opposite the longest side.

72² + 8.5² = 72.5²

5184 + 72.25 = 5256.25

5256.25 = 5256.25

Answer:

Step-by-step explanation:

1=a

Answer:

Step-by-step explanation:

Identity means to get itself

For multiplication,

if you  multiplied a number by 0, you would not get that number again, you would get 0.  so multiplying by 0 is not and identity

ex.  (a)(0)=0   does not = a so this is not an identity

if you multiplied a number by 1, yes that would be an identity because any number times 1 is itself

ex. a(1)=a    multiplied by 1 the number is itself, so yes this is an identity.

Answer:

B. 17.1°

Step-by-step explanation:

Given that triangle ABC has a right angle at C, BC = 4 units and AC = 13 units.

We can use the Pythagorean theorem to find the length of AB, which is the hypotenuse of the right triangle:

AB² = AC² + BC²

AB² = 13² + 4²

AB² = 169 + 16

AB² = 185

AB = sqrt(185)

Now, to find angle A, we can use the sine function:

sin(A) = opposite/hypotenuse

sin(A) = BC/AB

sin(A) = 4/sqrt(185)

A = sin⁻¹(4/sqrt(185))

Using a calculator, we can find that:

A ≈ 17.10 degrees

Answer:

B. 17.1°

Step-by-step explanation:

Given that triangle ABC has a right angle at C, BC = 4 units and AC = 13 units.

We can use the Pythagorean theorem to find the length of AB, which is the hypotenuse of the right triangle:

AB² = AC² + BC²

AB² = 13² + 4²

AB² = 169 + 16

AB² = 185

AB = sqrt(185)

Now, to find angle A, we can use the sine function:

sin(A) = opposite/hypotenuse

sin(A) = BC/AB

sin(A) = 4/sqrt(185)

A = sin⁻¹(4/sqrt(185))

Using a calculator, we can find that:

A ≈ 17.10 degrees

The probability of getting at least one three of a kind in 20 hands of poker is approximately 49%.

The Poisson approximation is a method of estimating the probability of a rare event. The formula used is P(x) = (e^lambda * lambdaˣ) / x! where lambda is the average number of occurrences of the event.

In this case, we are looking for the probability of getting at least one three of a kind in 20 hands of poker.

The probability of getting a three of a kind in one hand is 1/50.

Therefore, the average number of occurrences of a three of a kind in 20 hands is (20 x 1/50) = 0.4.

Using the Poisson approximation, we get P(x) = (e⁰.⁴ x (0.4)ˣ) / x!

In this case, x = 1, so

P(x) = (e⁰.⁴ x (0.4)¹) / 1

= 0.49

= 49%.

Therefore, the probability of getting at least one three of a kind in 20 hands of poker is approximately 49%.

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a) The relation set D is {(0,4), (0,5), (0,7), (3,6), (3,9), (4,4), (4,8), (4,12), (5,5), (5,10), (5,15), (7,7), (7,14)}. The relation diagram with arrows can be drawn as follows:

0 → 4, 5, 7
3 → 6, 9
4 → 4, 8, 12
5 → 5, 10, 15
7 → 7, 14


b) The relation set D-1 is {(4,0), (5,0), (7,0), (6,3), (9,3), (4,4), (8,4), (12,4), (5,5), (10,5), (15,5), (7,7), (14,7)}. The relation diagram with arrows can be drawn as follows:

4 → 0, 4, 8, 12
5 → 0, 5, 10, 15
7 → 0, 7, 14
6 → 3
9 → 3
8 → 4
12 → 4
10 → 5
15 → 5
14 → 7

a) The relation set D consists of pairs (x, y) such that x ∈ A and y ∈ B, and x divides y. D = {(0, 4), (0, 5), (0, 6), (0, 7), (0, 8), (0, 9), (0, 10), (0, 11), (3, 6), (3, 9), (4, 4), (4, 8), (5, 5), (5, 10), (7, 7)}. In the relation diagram, draw arrows from elements of A to elements of B according to these pairs.

b) The inverse relation set D⁻¹ consists of pairs (y, x) such that x ∈ A and y ∈ B, and x divides y. D⁻¹ = {(4, 0), (5, 0), (6, 0), (7, 0), (8, 0), (9, 0), (10, 0), (11, 0), (6, 3), (9, 3), (4, 4), (8, 4), (5, 5), (10, 5), (7, 7)}. In the relation diagram, draw arrows from elements of B to elements of A according to these pairs.

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