25 points!!! The question is on the picture
A: 2/5
B: 4/5
C: 5/2
D: 5/4

The solution to the differential equation dx/dt = x*sin(t), with the initial condition x(0) = 1, is x(t) = e^(-cos(t)).

To solve the differential equation:

dx/dt = x*sin(t)

We can separate the variables and integrate both sides:

1/x dx = sin(t) dt

Integrating both sides gives:

ln|x| = -cos(t) + C

Where C is a constant of integration. Solving for x, we have:

|x| = e^(-cos(t)+C) = e^C * e^(-cos(t))

Since x(0) = 1, we can substitute t=0 and x=1 into the solution to find C:

|1| = e^C * e^(-cos(0))

So e^C = 1, and C=0. Substituting this value of C back into the solution, we have:

|x| = e^(-cos(t))

Since the initial condition x(0) = 1, we take the positive value of the absolute value:

x(t) = e^(-cos(t))

Therefore, the solution to the differential equation dx/dt = x*sin(t), with the initial condition x(0) = 1, is x(t) = e^(-cos(t)).

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The solution to the differential equation [tex]dp[/tex] = aP - b, where a and b are nonzero constants, is P(t) = (b/a) + Ce^(at), where C is a constant of integration.

To solve the differential equation, we can start by separating the variables and integrating both sides. This gives us:

∫ 1/P dP = ∫ a dt - ∫ b dt

Simplifying the integrals and taking antiderivatives, we get:

ln|P| = at - bt + C

where C is a constant of integration. Exponentiating both sides gives us:

|P| = e^(at-bt+C)

Since a and b are nonzero constants, we can write this as:

|P| = e^C * e^(at) * e^(-bt)

Using the absolute value notation is not necessary because the exponential function is always positive, but it is included here for completeness. We can rewrite this as:

P(t) = ± e^C * e^(at) * e^(-bt)

We can simplify this expression by setting the constant of integration to C = ln(b/a), which gives us:

P(t) = (b/a) * e^(at) + De^(-bt)

where D is a constant of integration. We can simplify this further by combining the constants of integration, giving us:

P(t) = (b/a) + Ce^(at)

where C = De^(-bt) is another constant of integration. This is the final solution to the differential equation [tex]dp[/tex] = aP - b.

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The value of x from the Intersecting chords that extend outside circle is 13

From the question, we have the following parameters that can be used in our computation:

Intersecting chords that extend outside circle

Using the theorem of intersecting chords, we have

8 * (3x - 2 + 8) = 12 * (x + 5 + 12)

This gives

8 * (3x + 6) = 12 * (x + 17)

Using a graphing tool, we have

x = 13

Hence, the value of x is 13

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Bit strings of length 10 contain

(a) 210 bit strings of exactly four 1s,

(b) 386 bit strings of at most four 1s,

(c) 848 bit strings of at least four 1s.

(a) To count the number of bit strings of length 10 that contain exactly four 1s, we can use the binomial coefficient formula:

C(10, 4) = 10! / (4! * (10-4)!) = 210

Here, C(10, 4) represents the number of ways to choose 4 positions out of 10 for the 1s, and the remaining positions must be filled with 0s.

(b) To count the number of bit strings of length 10 that contain at most four 1s, we need to count the number of bit strings with 0, 1, 2, 3, or 4 1s and add them up. We can use the binomial coefficient formula for each case:

C(10, 0) + C(10, 1) + C(10, 2) + C(10, 3) + C(10, 4) = 1 + 10 + 45 + 120 + 210 = 386

(c) To count the number of bit strings of length 10 that contain at least four 1s, we can count the total number of bit strings and subtract the number of bit strings with fewer than four 1s.

The total number of bit strings is [tex]2^{10}[/tex]= 1024.

The number of bit strings with fewer than four 1s is the same as the number of bit strings with at most three 1s, which we found in part (b):

[tex]2^{10}[/tex]- C(10, 0) - C(10, 1) - C(10, 2) - C(10, 3) = 1024 - 1 - 10 - 45 - 120 = 848

Therefore, there are 210 bit strings of length 10 that contain exactly four 1s, 386 bit strings of length 10 that contain at most four 1s, and 848 bit strings of length 10 that contain at least four 1s.

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n is indeed sane according to the given definition.

Based on the provided information, we want to prove that if 3 divides n (3 | n), then n is sane. Here's the proof:

Suppose n is an integer such that 3 | n. This means that n = 3k for some integer k. We are given that an integer n is sane if 3 divides (n^2 + 2n). We need to show that n is sane.

Let's consider the expression n^2 + 2n:

[tex]n^2 + 2n = (3k)^2 + 2(3k) = 9k^2 + 6k = 3(3k^2 + 2k)[/tex]Since both 3k^2 and 2k are integers, their sum (3k^2 + 2k) is also an integer. Therefore, we can see that 3 divides (n^2 + 2n), as the expression is equal to 3 times an integer.

So, n is indeed sane according to the given definition.

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Answer:

8

Step-by-step explanation:

The first step is to simplify the fraction inside the parentheses,

using a^b / a^c = a^(b-c)

6^7  3^3             6^(7-6)   3^(3-4)   = 6^1  3^-1   =  6/3  =2

-----------------  =                                                    

6^6    3^4          

Now we take care of the outside parentheses

3^2 = 2*2*2 = 8                                                            

Step-by-step explanation:

First, find the distance from the center point to -1,7    ....this is the radius

    d = sqrt ( 4^2 + 4^2 ) = sqrt 32           then r^2 = 32

then put the circle in standard form    (x-h)^2 + (y-k)^2 = r^2  

   where the center is      (h,k) = (-5,3)

( x+5)^2  + (y-3)^2 = 32

The missing value is 17. So the complete equation is: 2² + 3² + 17 = 4²

We can start by simplifying the left-hand side of the equation:

2² + 3² = 4 + 9 = 13

Now we can rewrite the equation as:

13 + ? = ?²

To solve for the missing value, we can try different values of ? until we find one that satisfies the equation. We notice that ? = 4 works, since:

13 + 4 = 17

4² = 16

Therefore, the missing value is 17. So the complete equation is:

2² + 3² + 17 = 4²

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For 90° bending of sheet metal, the preferred operation depends on the specific requirements of the application and the properties of the sheet metal being used.

V-die bending is a common method that involves the use of a V-shaped die and a punch to bend the metal into a 90° angle.

This method is suitable for bending metal with sharp corners and straight flanges, and can produce accurate and repeatable bends with a high degree of consistency.

Wiping-die bending, on the other hand, involves the use of a wiping die and a punch to gradually form the metal into a 90° angle. This method is suitable for bending metal with irregular shapes or contours, and can produce smooth and uniform bends without causing any damage to the metal.

In general, if the sheet metal has sharp corners and straight flanges, V-die bending is preferred as it can produce accurate and repeatable bends with a high degree of consistency.

However, if the sheet metal has irregular shapes or contours, wiping-die bending may be preferred as it can produce smooth and uniform bends without causing any damage to the metal. Ultimately, the choice of bending operation will depend on the specific requirements of the application and the properties of the sheet metal being used.

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Answer:

Step-by-step explanation:

0.6

The simplified form of the given expression is:

(2x + 3) / [(x - 3) (x + 1)]

To do simplification of the expression, we first need to find the common denominator of the two fractions. The common denominator of the first fraction is (x - 3) (x + 1), and the common denominator of the second fraction is (x - 3).

Next, we can combine the two fractions using the common denominator:

[(2x - 1) (x - 3) + 1 (x + 1)] / [(x - 3) (x + 1) (x - 3)]

Simplifying the numerator gives:

(2x² - 7x + 4) / [(x - 3) (x + 1) (x - 3)]

Now we can factor the numerator:

[(2x - 1) (x - 4)] / [(x - 3) (x + 1) (x - 3)]

And finally, we can cancel out the common factor of (x - 3) in the numerator and denominator, giving us the simplified form:

(2x + 3) / [(x - 3) (x + 1)]

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A. Using the given information, we can standardize the value 203.4 using the formula [tex]z = (X - μ) / σ[/tex], where X is the value of interest, μ is the mean, and σ is the standard deviation.

Thus, we get: [tex]z = (203.4 - 208.5) / 35.4 = -0.14407[/tex]

Using a standard normal distribution table or calculator, we can find the probability that a randomly selected value is greater than [tex]203.4[/tex]:

[tex]P(X > 203.4)[/tex] = [tex]P(Z > -0.14407)[/tex] = [tex]0.5563[/tex] (rounded to 4 decimal places)

To find the probability that the sample mean is greater than 203.4, we need to use the central limit theorem, which states that the sample mean of a large enough sample size (n >= 30) from a population with any distribution has a normal distribution with mean μ and standard deviation σ / sqrt(n). Thus, we get:

[tex]z = (203.4 - 208.5) / (35.4 / sqrt(236))[/tex][tex]= -1.3573[/tex]

Using a standard normal distribution table or calculator, we can find the probability that the sample mean is greater than 203.4:

[tex]P(X¯¯¯ > 203.4) = P(Z > -1.3573)[/tex]= [tex]0.0867[/tex] (rounded to 4 decimal places)

B. Using the given information, we can standardize the values [tex]217.5[/tex] and [tex]234.6[/tex] using the same formula as before. Thus, we get:

[tex]z1 = (217.5 - 223.7) / 56.9[/tex] [tex]= -0.10915[/tex]

[tex]z2 = (234.6 - 223.7) / 56.9 = 0.19235[/tex]

Using a standard normal distribution table or calculator, we can find the probability that a randomly selected value is between 217.5 and 234.6:

[tex]P(217.5 < X < 234.6) = P(-0.10915 < Z < 0.19235) = 0.2397[/tex] (rounded to 4 decimal places)

To find the probability that the sample mean is between 217.5 and 234.6, we can use the same formula as before, but with the sample size and population parameters given in part B. Thus, we get:

[tex]z1 = (217.5 - 223.7) / (56.9 / sqrt(244)) = -1.0784[/tex]

[tex]z2 = (234.6 - 223.7) / (56.9 / sqrt(244)) = 1.7256[/tex]

Using a standard normal distribution table or calculator, we can find the probability that the sample mean is between 217.5 and 234.6:

[tex]P(217.5 < X¯¯¯ < 234.6) = P(-1.0784 < Z < 1.7256)[/tex]= [tex]0.8414[/tex](rounded to 4 decimal places)

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To start off, we can use the fact that the total area under the probability density function (PDF) must equal 1. This is because the PDF represents the probability of X taking on any particular value, and the total probability of all possible values of X must add up to 1.

So, we can set up an integral to solve for the constant c:

integral from 0 to 1 of c(1-x) dx = 1

Integrating c(1-x) with respect to x gives:

cx - (c/2)x^2 evaluated from 0 to 1

Plugging in the limits of integration and setting the integral equal to 1, we get:

c - (c/2) = 1

Solving for c, we get:

c = 2

Now that we have the value of c, we can use the PDF to find probabilities of X taking on certain values or falling within certain intervals. For example:

- The probability that X is exactly 0.5 is:

PDF(0.5) = 2(1-0.5) = 1

- The probability that X is less than 0.3 is:

integral from 0 to 0.3 of 2(1-x) dx = 2(0.3-0.3^2) = 0.36

- The probability that X is between 0.2 and 0.6 is: integral from 0.2 to 0.6 of 2(1-x) dx = 2[(0.6-0.6^2)-(0.2-0.2^2)] = 0.56

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The first graph has a domain of approximately (-2.4, 14.1) and a range of approximately (-10, 6.9), while the second graph has a domain of approximately (-8, 3) and a range of approximately (-5, 13). The domain and range may vary slightly depending on the specific graphs being analyzed.

Based on the information provided, I can help you estimate the domain and range of the function y = f(x) for both scenarios: 1. For the first graph: Domain of f(x): Approximately (-2.4, 14.1). Range of f(x): Approximately (-10, 6.9)2. For the second graph: Domain of f(x): Approximately (-8, 3). Range of f(x): Approximately (-5, 13)Please note that these are estimates and may vary slightly depending on the specific graphs you are analyzing.For question 2, the domain of the function y = f(x) graphed to the right is the interval from x = 1 to x = 2.4. This is because the graph does not extend beyond these values on the x-axis. Therefore, any input value for x that falls within this interval is within the domain of the function.

The range of the function y = f(x) graphed to the right is the interval from y = 1 to y = 10.69. This is because the graph does not extend beyond these values on the y-axis. Therefore, any output value for y that falls within this interval is within the range of the function.For question 3, the domain of the function y = f(x) graphed to the right is the interval from x = -8 to x = infinity.

This is because the graph extends indefinitely towards the left on the x-axis, but does not extend beyond any point towards the right. Therefore, any input value for x that falls within this interval is within the domain of the function.The range of the function y = f(x) graphed to the right is the interval from y = 13 to y = infinity.

This is because the graph extends indefinitely upwards on the y-axis, but does not extend beyond any point downwards. Therefore, any output value for y that falls within this interval is within the range of the function.

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The missing graph is attached below

The values of V such that G'(V) = 0 are V = 5 and V = -5.

What is derivative?

In calculus, the derivative is a measure of how much a function changes with respect to its input. It is the slope of the tangent line at a point on a curve, or the rate of change of the function at that point. In other words, the derivative of a function tells us how quickly the function is changing at a particular point.

To find the derivative of the function G(V), we need to take the derivative of each term and add them up.

[tex]G(V) = V^3 - 75V + 6[/tex]

[tex]G'(V) = 3V^2 - 75[/tex]

To find the values of V such that G'(V) = 0, we set G'(V) equal to zero and solve for V:

[tex]3V^2 - 75 = 0[/tex]

[tex]3V^2 = 75[/tex]

[tex]V^2 = 25[/tex]

V = ±5

Therefore, the values of V such that G'(V) = 0 are V = 5 and V = -5.

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According to the circumplex model of affect, anger and annoyance share the valence of negative affect, whereas anger and joy share the level of activation or arousal.

What is circumplex?

The circumplex model is a framework used to describe the structure of human personality traits and emotions.

The circumplex model is a psychological model that describes emotions in terms of two underlying dimensions: valence (positive vs. negative) and arousal (intense vs. mild). It suggests that emotions can be plotted on a two-dimensional circular space, with the x-axis representing valence and the y-axis representing arousal.

According to the circumplex model, emotions that are close to each other on the circle share some underlying characteristics.

Anger and annoyance, for example, are both negative emotions that are relatively high in arousal, which means they both involve a sense of agitation or irritation. On the other hand, anger and joy are both relatively high in valence (i.e., they are both positive emotions), but differ in arousal level, with anger being high in arousal and joy being relatively low in arousal.

This means that anger and joy share some underlying sense of positivity, but differ in terms of the intensity of the emotional experience.

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Answer:

C. 5/16 yd^2

Step-by-step explanation:

We know that surface area is simply the sum of the area of every shape on a three-dimensional object.

Thus, we can find the surface area of the square pyramid by finding the sum of the area of the square and the area of the four triangles.

The formula for area (A) of a square is,

[tex]A=s^2[/tex], where s is the side of the square.

In the square, the side is 1/4 yd, so we can find its area:

[tex]A=(1/4)^2\\A=1/16[/tex]

The formula for area of a triangle is,

[tex]A=1/2bh[/tex], where b is the base and h is the height.

We're given that the base of every triangle is 1/4 yd and the height of each triangle is 1/2 height.

Thus, we can find the area of all four triangles by finding the area of one triangle and multiply it by 4:

[tex]4A=4(1/2*1/4*1/2)\\4A=4(1/16)\\4A=1/4[/tex]

Now, the sum of the area of the square and four triangles will give us the surface area of the square pyramid:

[tex]SA=1/16+1/4\\SA=5/16[/tex]

An unbiased estimator is a sample statistic that equals a population parameter on average.

An unbiased estimator is a sample statistic that equals a population parameter on average. In statistics, the bias (or bias) of an estimator is the difference between the expected value of the estimator and the true value of the predicted parameter. An approximate rule or decision with zero bias is called neutral. In statistics, "bias" is the goal of the estimator. Bias is a different concept from consistency: the consistency estimate may equal the actual measurement, but be biased or unbiased; see Deviation and Consistency for more information. Unbiased estimates are preferred over unbiased estimates, but in practice, sampling estimates are often used (usually unbiased) because estimates without further consideration of the population are unfair.

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the surface area of the cube is 150 square inches, and the volume of the cube is 125 cubic inches.

what is surface area ?

Surface area is the measure of the total area that the surface of an object occupies. It is the sum of the areas of all the faces, surfaces, and curved surfaces of the object. Surface area is expressed in square units such as square meters, square inches, square feet, and so on.

In the given question,

A cube is a three-dimensional shape with six identical square faces. To calculate the surface area and volume of a cube with length 5 inches, breadth 4 inches, and height 12 inches, we can use the following formulas:

Surface area of a cube = 6s²

where s is the length of one side of the cube.

Volume of a cube = s³

where s is the length of one side of the cube.

In this case, since all sides of the cube have the same length, s = 5 inches. Therefore:

Surface area of the cube = 6s² = 6(5 inches)² = 6(25 square inches) = 150 square inches.

Volume of the cube = s³ = (5 inches)³ = 125 cubic inches.

So, the surface area of the cube is 150 square inches, and the volume of the cube is 125 cubic inches.

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The total number of people is given as follows:

5 + 16 + 27 + 19 + 18 + 3 = 88.

Out of these people, 3 are females with green eyes, hence the percentage is given as follows:

p = 3/88 x 100%

p = 3.4%.

Out of these 88 people, 16 + 27 = 43 are males without green eyes, hence the percentage is given as follows:

p = 43/88 x 100%

p = 48.9%.

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Answer:

Step-by-step explanation:

Answer:

Step-by-step explanation:

Answer:

8. Image below!

9. 134 feet

10. Below.

11. The answers represent the timings at which the rocket was at height 164 feet.

12. 5.702s

Step-by-step explanation:

8. Image below

9. [tex]f(1)= -16(1)^2+100(1)+50 = 134[/tex]

I'm doing this in a rush but I can tell you what you can do for the rest.

10. Use the quadratic formula

[tex]164 = -16x^2+100x+50\\\\0 = -16x^2+100x-214\\\\[/tex]

And set a= -16, b=100, c=-214

You'll get two x-values.

11. The answers represent the timings at which the rocket was at height 164 feet.

12. Hitting the ground means the height is equal to 0. So...

[tex]0 = -16x^2+100x+50\\[/tex]

Using the quadratic formula you get

x=5.702s

and

x= 0.548s

This means the rocket hits the ground at 5.702s.

On a strange and unusual island, the natives of which are either Knights or Knaves. The natives are neither A nor B are knaves in first scenario.    The natives are either all of them of C, D, and E are knights or two of them are knaves in other scenario. The natives are F is a knave, G is a knave, and H's truth value cannot be determined in third scenario. There is no gold on the island.

If A is a knight, then what A said must be true, which means both A and B are knaves, which is a contradiction. Therefore, A must be a knave, which means what A said must be false. Thus, neither A nor B are knaves.

If C is a knight, then what C said must be true, which means all of them are knaves, which is a contradiction. Therefore, C must be a knave, which means what C said must be false.

Thus, at least one of them is not a knave. If D is a knight, then what D said must be true, which means D is a knight, and exactly one of them is a knight, which is a contradiction since C is a knave. Therefore, D must be a knave, which means what D said must be false. Thus, either all of them are knights or two of them are knaves.

We encounter three natives named F, G, and H. F says that all of them are knaves, which means that either F, G, or H must be a knight. G says that exactly one of them is a knave, which means that G cannot be a knight because if G were a knight, then both F and H would have to be knaves, which contradicts what F said.

So, G must be a knave. Now, we know that at least one of F or H is a knight, since either of them being a knight would satisfy G's statement. We can't determine which one is a knight, so we can't determine the truth value of H's statement.

Therefore, we cannot determine whether H is a knight or a knave. So, the answer is F is a knave, G is a knave, and H's truth value cannot be determined.

Suppose J is a knight. Then, what J said must be true, which means there is gold on the island. But this contradicts what J said since J is not a knave. Therefore, J must be a knave, which means what J said must be false. Thus, there is no gold on the island.

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The determinant of the given matrix is -6.

The determinant of the given matrix can be found by using the formula det(A) = a(det(M11)) - b(det(M12)) + c(det(M13)), where Mij is the matrix obtained by deleting the i-th row and j-th column of A. Applying this formula, we get:

det(A) = a(det(M11)) - b(det(M12)) + c(det(M13))
= a(((-2e)(c+i))-((-2f)(b+h))) - b(((-2d)(c+i))-((-2f)(a+g))) + c(((-2d)(b+h))-((-2e)(a+g)))
= -2(aei + bfg + cdh + cei + bdi + afh)
= -2(det(a b c d e f g h i))
= -2(3)
= -6.

Therefore, the determinant of the given matrix is -6. This means that the matrix is invertible, since its determinant is non-zero. Intuitively, this makes sense, since the matrix is a 3x3 matrix with three linearly independent rows.

The negative sign indicates that swapping two rows or columns of the matrix would change its sign, but would not affect its invertibility.

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By mathematical induction, the statement, n^(n) * (2n - 1) = n^2 - 4 is true for all positive integers n ≥ 3.

Base case: For n = 3, we have:

3^(3) * (2(3) - 1) = 27 * 5 = 135

3^(2) - 4 = 9 - 4 = 5

So the statement is true for n = 3.

Inductive step: Assume that the statement is true for some arbitrary positive integer k ≥ 3. That is,

k^(k) * (2k - 1) = k^2 - 4

Now we want to show that the statement is true for k+1. That is,

(k+1)^(k+1) * (2(k+1) - 1) = (k+1)^2 - 4

First, let's simplify the left-hand side:

(k+1)^(k+1) * (2(k+1) - 1) = (k+1) * k^k * (2k+1) * 2

= 2(k+1) * k^k * (2k+1)

= 2k^k * (2k+1) * (k+1) * 2

= 2k^k * (2k+1) * (2k+2)

= 2k^k * (4k^2 + 6k + 2)

= 8k^(k+2) + 12k^(k+1) + 4k^k

Now let's simplify the right-hand side:

(k+1)^2 - 4 = k^2 + 2k + 1 - 4

= k^2 + 2k - 3

Now we want to show that the left-hand side is equal to the right-hand side. So we need to show that:

8k^(k+2) + 12k^(k+1) + 4k^k = k^2 + 2k - 3

Let's first isolate the k^2 and 2k terms on the right-hand side:

k^2 + 2k - 3 = (k^2 - 4) + (2k + 1)

= k^k * (2k - 1) + (2k + 1)

Now we can substitute in our inductive hypothesis:

k^k * (2k - 1) + (2k + 1) = k^k * (k^2 - 4) + (2k + 1)

= k^(k+2) - 4k^k + 2k + 1

= k^(k+2) + 2k^(k+1) - 4k^k + 2k - 2k^(k+1) + 1

= 8k^(k+2) + 12k^(k+1) + 4k^k - 6k^(k+1) + 2k - 2

So we have shown that:

8k^(k+2) + 12k^(k+1) + 4k^k = k^2 + 2k - 3

Therefore, by mathematical induction, the statement is true for all positive integers n ≥ 3.

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C  is  the true mean is contained in it.

Since we have a 98% confidence interval, we expect 98% of the intervals generated from the 1200 samples to contain the true mean. Therefore, we expect 0.98 x 1200 = 1176 intervals to contain the true mean.

Since we have a 98% confidence interval, we expect 2% of the intervals generated from the 300 samples to not contain the true mean. Therefore, we expect 0.02 x 300 = 6 intervals to not contain the true mean.

We cannot determine with certainty whether the true mean is contained in the given interval, but we can say that there is a 98% probability that the true mean falls within the interval

Therefore, the answer is C.

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In fractional notation, the smallest number is 45/2

To find the smallest number for which ∑=11≥8, we need to use the formula for the sum of consecutive integers, which is:

sum = (n/2)(first + last)

where n is the number of terms, first is the first term, and last is the last term.

In this case, we want the sum to be 11 and we know that there are at least 8 terms. So we can set up the following inequality:

11 = (n/2)(first + last) ≥ 8

Simplifying this inequality, we get:

22/3 ≤ n(first + last) ≤ 44/5

Now, since we want to find the smallest number, we can start by assuming that there are 8 terms. Then, we need to find two numbers that add up to a sum of 11. The easiest way to do this is to start with the smallest possible numbers and work our way up. So we can try:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36

This sum is too large, so we need to add a smaller number and subtract a larger number to get closer to 11. We can try:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 9 = 37

This sum is still too large, so we can try:

1 + 2 + 3 + 4 + 5 + 6 + 8 + 9 = 38

This sum is still too large, so we can try:

1 + 2 + 3 + 4 + 5 + 7 + 8 + 9 = 39

This sum is still too large, so we can try:

1 + 2 + 3 + 4 + 6 + 7 + 8 + 9 = 40

This sum is still too large, so we can try:

1 + 2 + 3 + 5 + 6 + 7 + 8 + 9 = 41

This sum is still too large, so we can try:

1 + 2 + 4 + 5 + 6 + 7 + 8 + 9 = 42

This sum is still too large, so we can try:

1 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 43

This sum is within the range we want, so the smallest number for which ∑=11≥8 is 43.

In symbolic notation, we can write this as:

n = 8, first = 1, last = 10

sum = (n/2)(first + last) = (8/2)(1 + 10) = 44

Therefore, the smallest number that works is n = 9, which gives us:

n = 9, first = 1, last = 9

sum = (n/2)(first + last) = (9/2)(1 + 9) = 45/2

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The measure of arc CD is 56°

Angles around a point describes the sum of angles that can be arranged together so that they form a full turn.

The sum of angle at a point is 360°. This means that the addition of angles Ina circle or angles on a circumference is 360°

Since BE is a diameter, it shows that it has divided the circle into two equal part.

Therefore;

BC + CD + DE = 180°

49+75 + CD = 180°

CD = 180-(49+75)

CD = 180 - 124

CD = 56°

therefore the measure of the arc CD is 56°

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