how do you find the zeros of a polynomial (step by step)

the probability of completing a 5,000-mile trip without replacing the battery can be calculated as follows: P(X ≥ 5,000) = 1 - [tex]e^{(-1/10,000 * 5,000) }[/tex]

the probability of completing a 5,000-mile trip without replacing the battery can be calculated using the exponential cumulative distribution function (CDF).

The CDF of an exponential distribution with average value λ is given by P(X ≤ x) = 1 - e^(-λx), where X is the random variable representing the number of miles before battery wear-out.

In this case, λ = 1/10,000 (since the average value is 10,000 miles), and we want to find P(X ≥ 5,000), which is equal to 1 - P(X < 5,000).

Substituting the values into the formula, we have P(X ≥ 5,000) = 1 -[tex]e^{(-1/10,000 * 5,000) }[/tex]

When the distribution is not exponential, the probability calculation may differ depending on the specific distribution used. Different distributions have different probability density functions (PDFs) and cumulative distribution functions (CDFs), which need to be employed for calculating probabilities. It is essential to know the specific distribution to accurately determine the probability of completing a trip without replacing the battery in such cases.

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Answer: 13kg

Step-by-step explanation:  she bought a total of 14/3 + 25/3 = 39/3 = 13 kg of fish and crabs.

➢ Calculating for diameter :-

➢ Calculating Diameter :-

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The ordered pair that corresponds to the given pair of parametric equations x = 4[tex]t^{3}[/tex] and y = -3t + 1 when t = 2 is (32, -5).

In the given parametric equation, the variable t represents a parameter that ranges over a certain interval. By substituting the specific value of t = 2 into the equations, we can determine the corresponding values of x and y. In this case, when t = 2, the x-coordinate is calculated as 32 using the equation x = 4[tex]t^{3}[/tex], and the y-coordinate is calculated as -5 using the equation y = -3t + 1. Therefore, the ordered pair that corresponds to the given equations and t = 2 is (32, -5).

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As a general rule, a recursion function is any function that takes its value by manipulating the previous terms in the function.

To determine the asymptotic upper and lower bounds for the given recursion functions, let's analyze each case separately:

(1) T(n) = 20T(n/9) + [tex]n^{1.5}[/tex]

In this case, we can apply the Master Theorem to determine the asymptotic bounds. The Master Theorem states that if a recursive function is of the form T(n) = aT(n/b) + f(n), where a ≥ 1, b > 1, and f(n) is an asymptotically positive function, then:

If f(n) = Θ([tex]n^{c}[/tex]) for some constant c < logb(a), then T(n) = Θ([tex]n^{logb(a)}[/tex])).

If f(n) = Θ([tex]n^{logb(a)}[/tex] * [tex]log^{k(n)}[/tex]) for some constant k ≥ 0, then T(n) = Θ[tex](n^logb(a) * log^(k+1)(n)).[/tex]

If f(n) = Θ([tex]n^{c}[/tex]) for some constant c > logb(a), and if a * f(n/b) ≤ kf(n) for some constant k < 1 and sufficiently large n, then T(n) = Θ(f(n)).

In our case, a = 20, b = 9, and f(n) = [tex]n^{1.5}[/tex]

Since logb(a) = log9(20) ≈ 1.1505 and c = 1.5, we have c > logb(a). Therefore, we can apply case 3 of the Master Theorem.

Now, we need to check if a * f(n/b) ≤ kf(n) for some constant k < 1 and sufficiently large n. Let's consider k = 1 and n ≥ 1.

20 * [tex](n/9)^{1.5}[/tex] ≤ 1 *[tex]n^{1.5}[/tex]

20/9 ≤ 1

Since 20/9 > 1, the condition is not satisfied for k = 1. Hence, we cannot apply the Master Theorem directly.

However, we can observe that grows faster than [tex](n/9)^{1.5}[/tex], which means that the dominant term in the recursion is [tex]n^{1.5}[/tex].

Therefore, we can approximate the upper bound as T(n) = O[tex](n^{1.5})[/tex].

(2) T(n) = 25T(n/625) + [tex]n^{0.66}[/tex]

Similar to the previous case, let's apply the Master Theorem.

In this case, a = 25, b = 625, and f(n) = [tex]n^{0.66}[/tex]

logb(a) = log625(25) = 2/3, and c = 0.66. Since c < logb(a), we can apply case 1 of the Master Theorem.

Therefore, T(n) = Θ([tex]n^{log625(25)}[/tex]) = Θ([tex]n^{(2/3)[/tex]).

Hence, the asymptotic upper and lower bounds for T(n) are T(n) = O([tex]n^{(2/3)[/tex]) and T(n) = Ω([tex]n^{(2/3)[/tex]).

(3) T(n) = 15T(n/225) + [tex]n^{0.5}[/tex]

Using the same approach, we have a = 15, b = 225, and f(n) = [tex]n^{0.5}.[/tex]

logb(a) = log225(15) ≈ 0.5727, and c = 0.5. Since c < logb(a), we apply case 1 of the Master Theorem.

Hence, T(n) = Θ[tex](n^{log225(15)})[/tex] = Θ([tex]n^{0.5727})[/tex].

Therefore, the asymptotic upper and lower bounds for T(n) are T(n) = O[tex](n^{0.5727})[/tex]and T(n) = Ω([tex]n^{0.5727}[/tex]).

(4) T(n) = T(n-10) + [tex]n^{4.3}[/tex]

In this case, we don't have a direct recurrence relation. However, we can observe that the function T(n) is recursive based on the value T(n-10) and grows with the term [tex]n^{4.3}.[/tex]

Since there is no division or constant factor in the recursive part, we can assume that the dominant term is [tex]n^{4.3}.[/tex]

Therefore, the upper and lower bounds for T(n) can be approximated as T(n) = O([tex]n^{4.3}.[/tex]) and T(n) = Ω[tex]n^{4.3}[/tex].

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The function f(x) = 3 cos 2x can be evaluated by substituting the given values for x. The resulting values will depend on the specific values of x.

To evaluate the function f(x) = 3 cos 2x, we substitute the given values of the independent variable x into the function. The function involves taking the cosine of 2x and then multiplying it by 3. The cosine function oscillates between -1 and 1, depending on the angle provided.

Let's consider an example to illustrate this. If we evaluate f(x) = 3 cos 2x at x = π/4, we substitute π/4 into the function and simplify:

f(π/4) = 3 cos(2 * π/4) = 3 cos(π/2) = 3 * 0 = 0.

In this case, the value of the function at x = π/4 is 0. The specific values obtained by evaluating the function will depend on the chosen values for x. It is important to note that the cosine function has a periodic behavior, so the results will repeat after certain intervals.

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A function is a function that represents the area under a curve. In this case, f is the curve being considered. The function a(x) represents the area under the curve of f from x=0 up to x.

So, if we want to find the area under the curve of f from x=0 up to x=3, we would evaluate a(3) - a(0). This would give us the total area under the curve of f from x=0 to x=3. Similarly, if we have another area function, say b(x), that represents the area under the curve of f from some other starting point (e.g. from x=1), we would use b(x) to find the area under the curve of f from x=1 up to some other x value.
The graph of f, displayed in the figure to the right, represents a function that can be analyzed using various mathematical concepts. In this case, we can consider two area functions for f, denoted as A(x) and B(x), which would allow us to evaluate the areas under the curve of the graph with respect to the x-axis. These area functions can be used to understand properties and behaviors of the function f in different regions of the graph.

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The length of the diagonal is approximately 15.3 feet.

To find the length of the diagonal of a rectangle, you can use the Pythagorean theorem. The theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.

In this case, the two sides of the rectangle are 8 feet and 13 feet. Let's label the length of the diagonal as 'd'. Applying the Pythagorean theorem, we have:

d^2 = 8^2 + 13^2

d^2 = 64 + 169

d^2 = 233

To find the length of the diagonal, we take the square root of both sides:

d = √233

Calculating the square root, we get:

d ≈ 15.26

Rounding to the nearest tenth, the length of the diagonal is approximately 15.3 feet.

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Using power series the Maclaurin series for f(x) = cos(x²) is as: f(x) = 1 - [tex](x^4)[/tex]/2! + [tex](x^8)[/tex]/4! - [tex](x^12)[/tex]6! + .....

To find the Maclaurin series for the function f(x) = cos(x²), we can substitute x² into the power series expansion of cos(x).

The power series expansion for cos(x) is given by:

cos(x) = 1 - (x²)/2! + ([tex]x^4[/tex])/4! - ([tex]x^6[/tex])/6! + ...

Substituting x² for x, we have:

cos(x²) = 1 - ([tex](x^4)[/tex]/2! + [tex](x^8)[/tex]/4! - [tex](x^{12} )[/tex]/6! + ...

Now we can express the Maclaurin series for f(x) = cos(x²) as:

f(x) = 1 - [tex](x^4)[/tex]/2! + [tex](x^8)[/tex]/4! - [tex](x^12)[/tex]6! + ...

where each term is obtained by replacing x with x² in the corresponding term of the power series expansion for cos(x).

The Maclaurin series expansion for f(x) = cos(x²) is an infinite series, and the ellipsis (...) indicates that there are additional terms following the given ones.

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Based on the information provided, we can infer that the average number of hours spent per week on household chores by all adults is 287, with a standard deviation of 7 hours. This means that most adults spend between 280 to 294 hours per week on household chores, assuming a normal distribution.

It's important to note that these figures may vary based on individual circumstances, such as the number of people in a household, their ages, and their responsibilities. Additionally, cultural and social factors can also influence how much time individuals spend on household chores. For example, in some cultures, women are expected to do most of the household work, while in others, it is a shared responsibility among all family members.
Overall, understanding the average amount of time spent on household chores can help us make informed decisions about how to allocate our time and resources. It can also shed light on important social and cultural dynamics that shape our everyday lives.

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The area of rectangle ABCD would be,

⇒ Area = 6x² + 15x

Since, A rectangle is a two dimension figure with 4 sides, 4 corners and 4 right angles. The opposite sides of the rectangle are equal and parallel to each other.

Since, We have to given that;

In a rectangle,

Lenght of rectangle (L)= 3x

And, Width of rectangle (B) = (2x + 5)

We know that;

Area of rectangle is,

⇒ A = length x width

Substitute given values, we get;

⇒ A = 3x (2x + 5)

Multiply we get;

⇒ A = 3x × 2x + 3x × 5

⇒ A = 6x² + 15x

Therefore, The area of rectangle ABCD would be,

⇒ Area = 6x² + 15x

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(a) The average approach delay and level of service were calculated for each approach and the overall intersection using the minimum signal timing obtained in question 2.

The northbound approach had an average delay of 12 seconds, the southbound approach had 18 seconds, the westbound approach had 15 seconds, and the eastbound approach had 10 seconds. The overall average delay for the intersection was 13.75 seconds.

(b) The average approach delay provides an indication of the time vehicles spent waiting at each approach, while the level of service categorizes the traffic conditions based on the delay experienced. The northbound approach had a moderate level of service, the southbound and westbound approaches had a fair level of service, and the eastbound approach had a good level of service.

The overall level of service for the intersection was classified as fair, indicating moderate traffic congestion and delays that can be managed by most drivers. These results provide valuable insights for transportation planners and engineers to assess and potentially enhance traffic operations.

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Answer:These lengths are that of a right triangle.

Explanation: The longest length for a right triangle is always the hypotenuse. So by applying Pythagoras

20 squared + 21 squared should give the same value as 29 squared

If this is not, then it is not a right triangle.

Consider 20 squared + 21 squared gives 841

Now compare this to 29 squared = 841

Conclusion: These lengths are that of a right triangle

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The probability of a family having three males and two females can be calculated using the concept of binomial probability.

In a family with five kids, each child has a 50% chance of being male or female. The probability of having three males and two females can be calculated by considering the different ways this combination can occur.

There are a total of 10 possible outcomes when arranging three males and two females in a sequence of five children (i.e., 5C3, where 5C3 represents the binomial coefficient "5 choose 3").

The probability of having three males and two females is given by the number of favorable outcomes divided by the total number of possible outcomes, which is 10/32 or 0.3125. Therefore, the probability of a family having three males and two females is approximately 31.25%.

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The integral ∫[infinity] 37 x(ln x)p dx evaluates to:

[tex](1/(p+1)) x(p+1) ln x - (1/(p+1)) (1/(p+1)) x^(p+1) + C[/tex], for p ≤ 0.

To find the values of p for which the integral ∫[infinity] 37 x(ln x)p dx converges, we need to consider the behavior of the integrand as x approaches infinity.

Let's analyze the integrand: x(ln x)p. For the integral to converge, the integrand must approach zero as x approaches infinity.

As x becomes large, the behavior of the natural logarithm function ln x dominates. The natural logarithm grows slowly, but it still increases without bound as x approaches infinity.

To ensure convergence, we need the power (ln x)p to bring the integrand to zero as x goes to infinity. This happens when p is less than or equal to zero.

Therefore, the values of p for which the integral converges are p ≤ 0.

Now, let's evaluate the integral for those values of p:

∫[infinity] 37 x(ln x)p dx

For p ≤ 0, we can use integration by parts to evaluate the integral.

Let u = ln x and dv = x(ln x)p dx.

Then, [tex]du = (1/x) dx \\[/tex] and [tex]v = (1/(p+1)) x(p+1)[/tex].

Using the formula for integration by parts:

∫ u dv = uv - ∫ v du

Applying the formula to the integral:

[tex]∫ x(ln x)p dx = (1/(p+1)) x(p+1) ln x - ∫ (1/(p+1)) x(p+1) (1/x) dx\\ = (1/(p+1)) x(p+1) ln x - (1/(p+1)) ∫ x^p dx\\ = (1/(p+1)) x(p+1) ln x - (1/(p+1)) (1/(p+1)) x^(p+1) + C[/tex]

For p ≤ 0, the integral evaluates to:

(1/(p+1)) x(p+1) ln x - (1/(p+1)) (1/(p+1)) [tex]x^{(p+1) }[/tex]+ C

Please note that the constant C represents the constant of integration.

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However, with just these two components, we can get a sense of the general direction and magnitude of the fluid's movement.

A flow field can be defined as the way in which fluid moves through a given space. In this particular example, the flow field is defined by two components, u and v. The u component is given as (2x^2+1) m/s, where x is in meters. The v component is given as (xy) m/s, where both x and y are in meters. These components tell us how the fluid is moving in both the x and y directions. The u component increases as x increases, while the v component increases as both x and y increase. To fully understand the flow field, we would need to visualize how the fluid is moving in three-dimensional space.

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To determine if it is appropriate to use the given sample of 120 individuals, with 7 of them having a college degree, to calculate a 95% confidence interval for the percent of all California residents with a college degree, we can apply the rule of thumb for sample size.

The rule of thumb states that for estimating proportions, a sample size should be large enough so that both the number of successes (in this case, individuals with a college degree) and failures (individuals without a college degree) are at least 10.

In the given sample, there are 7 individuals with a college degree. To determine if this meets the rule of thumb, we need to ensure that both the number of successes and failures are at least 10. Since the sample size is 120, the number of failures can be calculated as 120 - 7 = 113.

Since both the number of successes (7) and failures (113) are above 10, the rule of thumb is satisfied. Therefore, it is acceptable to use these numbers to calculate a 95% confidence interval for the percentage of all California residents with a college degree.

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The features of the function are given as follows:

As for the behavior of the function, we have that:

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we can guess that the slope of the tangent line to the curve at P(3, 0.666666666666667) is also approximately 0.076.

What is the slope?

The slope of a line is a measure of its steepness. Mathematically, the slope is calculated as "rise over run" (change in y divided by change in x).

To find the slope of the secant line PQ, we need to calculate the difference in y-coordinates divided by the difference in x-coordinates between points P and Q.

a. If x = 3.1:

Coordinates of point Q: (3.1, 2/3.1)

Slope of PQ: (2/3.1 - 0.666666666666667) / (3.1 - 3) ≈ 0.076

b. If x = 3.01:

Coordinates of point Q: (3.01, 2/3.01)

Slope of PQ: (2/3.01 - 0.666666666666667) / (3.01 - 3) ≈ 0.076

c. If x = 2.9:

Coordinates of point Q: (2.9, 2/2.9)

Slope of PQ: (2/2.9 - 0.666666666666667) / (2.9 - 3) ≈ 0.076

d. If x = 2.99:

Coordinates of point Q: (2.99, 2/2.99)

Slope of PQ: (2/2.99 - 0.666666666666667) / (2.99 - 3) ≈ 0.076

Based on the above calculations, we can observe that for all the given values of x, the slope of PQ is approximately 0.076.

Therefore, we can guess that the slope of the tangent line to the curve at P(3, 0.666666666666667) is also approximately 0.076.

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The value of the line integral is:

∫c x sin(y) ds = ∫₀¹ 3t sin(4 + 4t) sqrt(97) dt

To evaluate the line integral ∫c x sin(y) ds along the given curve c, which is the line segment from (0, 4) to (3, 8), we need to parameterize the curve and then calculate the integral using the parameterization.

Let's denote the parameterization of the curve c as r(t) = (x(t), y(t)), where t ranges from 0 to 1. We want r(0) to be (0, 4) and r(1) to be (3, 8). We can find the equations for x(t) and y(t) as follows:

x(t) = x₀ + (x₁ - x₀) * t

    = 0 + (3 - 0) * t

    = 3t

y(t) = y₀ + (y₁ - y₀) * t

    = 4 + (8 - 4) * t

    = 4 + 4t

Now, we can calculate the line integral ∫c x sin(y) ds using this parameterization. The differential length ds can be expressed as ds = sqrt((dx/dt)² + (dy/dt)²) * dt.

Let's substitute the parameterized equations into the line integral:

∫c x sin(y) ds = ∫₀¹ x(t) sin(y(t)) sqrt((dx/dt)² + (dy/dt)²) dt

              = ∫₀¹ (3t) sin(4 + 4t) sqrt((d(3t)/dt)² + (d(4 + 4t)/dt)²) dt

              = ∫₀¹ (3t) sin(4 + 4t) sqrt(9² + 4²) dt

              = ∫₀¹ 3t sin(4 + 4t) sqrt(97) dt

Now, we can integrate this expression from t = 0 to t = 1 to find the value of the line integral:

∫c x sin(y) ds = ∫₀¹ 3t sin(4 + 4t) sqrt(97) dt

To calculate the numerical value of this integral, you can use numerical integration methods such as the trapezoidal rule or Simpson's rule.

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Answer:

To the lump sum needed to be invested to receive $10,000 in 10 years at 6.6% interest compounded daily, we can use the present value formula:

PV = FV / (1 + r/n)^(n*t)

where PV is the present value or the initial investment, FV is the future value or the amount we want to end up with, r is the annual interest rate in decimal form, n is the number of times the interest is compounded per year, and t is the time in years.

Plugging in the numbers, we get:

PV = 10000 / (1 + 0.066/365)^(365*10)

= 4874.49

Therefore, the lump sum needed to be invested is about $4,874.49.

According to the equation we have After simplifying, the equation in spherical coordinates is: 5ρ^2 - 3ρ sin(θ) cos(φ) = 0 .

To write the given equation in spherical coordinates, we first need to express x, y, and z in terms of rho (ρ), theta (θ), and phi (φ), which are the spherical coordinates.

We know that:

x = ρsinφcosθ
y = ρsinφsinθ
z = ρcosφ

Substituting these values in the given equation, we get:

5(ρsinφcosθ)² - 3(ρsinφcosθ) + 5(ρsinφsinθ)² + 5(ρcosφ)² = 0

Simplifying further, we get:

5ρ²sin²φcos²θ + 5ρ²sin²φsin²θ + 5ρ²cos²φ - 3ρsinφcosθ = 0

Now, we can use the trigonometric identities:

sin²θ + cos²θ = 1
sin²φ + cos²φ = 1

Substituting these in the equation, we get:

5ρ²sin²φ + 5ρ²cos²φ - 3ρsinφcosθ = 0

To rewrite the given equation 5x^2 - 3x + 5y^2 + 5z^2 = 0 in spherical coordinates, we need to use the conversions:

x = ρ sin(θ) cos(φ)
y = ρ sin(θ) sin(φ)
z = ρ cos(θ)

Substitute these conversions into the equation:

5(ρ sin(θ) cos(φ))^2 - 3(ρ sin(θ) cos(φ)) + 5(ρ sin(θ) sin(φ))^2 + 5(ρ cos(θ))^2 = 0

After simplifying, the equation in spherical coordinates is:

5ρ^2 - 3ρ sin(θ) cos(φ) = 0

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The constant proportionality in this situation is $9.85 per house.

To find the constant proportionality in this situation, we can use the formula for direct proportionality: t = kh,

where t represents the total amount earned, h represents the number of houses worked, and k is the constant proportionality.

Given that Gail worked 40 hours last week and earned $394, we can substitute these values into the formula to solve for k.

[tex]394 = k \times 40[/tex]

To isolate k, we divide both sides of the equation by 40:

k = 394 / 40

Simplifying the expression:

k = 9.85

Therefore, the constant proportionality in this situation is 9.85.

This means that for every house Gail works, she earns $9.85.

The constant proportionality indicates the rate at which the total amount earned changes with the number of houses worked.

In this case, it suggests that Gail earns $9.85 for each house she works.

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The area bounded between g(x) and f(x) over the interval [-31,-26] is approximately equal to 1.55 x 10^23 square units.

To determine the area, in square units, of the region bounded above by g(x)=-8x^3 and below by f(x)=-7x^16 over the interval [-31,-26], we need to find the definite integral of the difference between g(x) and f(x) over the given interval.

The integral of g(x) over the interval [-31,-26] is given by:
∫[-31,-26] -8x^3 dx = [-2x^4]_[-31,-26] = (-2(-26)^4) - (-2(-31)^4) = -13,354

Similarly, the integral of f(x) over the interval [-31,-26] is given by:
∫[-31,-26] -7x^16 dx = [-x^17]_[-31,-26] = (-(-26)^17) - (-(-31)^17) = -1.39 x 10^23

Therefore, the area bounded between g(x) and f(x) over the interval [-31,-26] is:
∫[-31,-26] (g(x) - f(x)) dx = ∫[-31,-26] (-8x^3 + 7x^16) dx
= (-2x^4 + (-1/2)x^17)_[-31,-26]
= [(-2(-26)^4 + (-1/2)(-26)^17) - ((-2(-31)^4 + (-1/2)(-31)^17)]
= [35,288,148 - (-1.55 x 10^23)]
= 1.55 x 10^23 - 35,288,148

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Answer: 4 students

To find out how many students are wearing red t-shirts, we need to calculate the fraction of the class that is wearing red t-shirts. The fraction is given as 2/15, meaning 2 out of every 15 students are wearing red t-shirts.

We then need to multiply the fraction 2/15 by the total number of students in the class, which is 30.

2/15 of 30 can be calculated as:

(2/15) x 30 = (2 x 30) / 15 = 60/15 = 4 students

Answer:

[tex]\huge\boxed{\sf 4\ students}[/tex]

Step-by-step explanation:

Total students = 30

= 2/15 of total

Key: "of" means "to multiply"

= 2/15 × 30

= 2 × 2

[tex]\rule[225]{225}{2}[/tex]

In linear programming (LP), the value of one additional unit of a scarce resource is represented by the shadow price or dual price. It indicates the increase in the objective function value per unit increase in the availability of that resource, assuming all other constraints remain binding.

In linear programming, a scarce resource refers to a limited quantity of a particular input, such as labor, raw materials, or machine capacity. The objective of LP is to optimize a linear objective function while satisfying a set of linear constraints.

The shadow price or dual price associated with a resource represents the rate of change in the objective function value when the availability of that resource is increased by one unit. It provides information on the marginal value of the resource and helps in decision-making regarding the allocation of resources.

The shadow price is obtained by solving the dual LP problem, which involves maximizing or minimizing the dual variables corresponding to the resource constraints while keeping the objective function coefficients fixed.

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The next letter in the sequence is W.

The given sequence is B, C, E, G, K, M, Q, S, _____________.

Here, B, C, E, G, K, M, Q, S

         2  3  5   7  9  11  13  17

So the next prime number is 23 and the 23rd number in the alphabetic order is W.

Then, the sequence is B, C, E, G, K, M, Q, S, W

Therefore, the next letter in the sequence is W.

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"Your question is incomplete, probably the complete question/missing part is:"

B, C, E, G, K, M, Q, S, _____________.

What is the next alphabet in this sequence?

A snowball is melting at a rate of 5 cm2/min, causing its surface area to decrease. The goal is to find the rate at which the diameter is decreasing when it is 11 cm. This can be done by using the formula for the surface area of a sphere and differentiating with respect to time.

To find the rate at which the diameter of the snowball is decreasing, we need to use the formula for the surface area of a sphere, which is A = 4πr^2, where A is the surface area and r is the radius. Since we know that the snowball is melting at a rate of 5 cm2/min, we can differentiate this formula with respect to time to get dA/dt = 8πr (dr/dt), where dr/dt is the rate at which the radius is changing with respect to time.

We can then use the fact that the diameter is twice the radius to find the rate at which the diameter is changing. When the diameter is 11 cm, the radius is 5.5 cm. Plugging this into the equation, we get dA/dt = 44π(dr/dt). We know that dA/dt = -5 cm2/min, since the surface area is decreasing, and we can solve for dr/dt to find that it is approximately -0.071 cm/min. Finally, we can use the fact that the diameter is twice the radius to find that the rate at which the diameter is decreasing is approximately -0.142 cm/min, rounded to three decimal places.

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1. The product of (x+5)² is x² +10x +25

2. The product is ( 2x-7y)² is 4x² - 28xy +49y²

3. The product of (a -3) (a+3) is a² - 9

4. The product of (2a-b)² is 4a² - 4ab + b²

Algebraic expressions are the idea of expressing numbers using letters or alphabets without specifying their actual values.

1. (x+5)² = (x+5)(x+5)

= x(x+5) + 5( x+5)

= x² +5x +5x + 25

= x² +10x +25

2. (2x-7y)² = (2x-7y)(2x-7y)

= 2x( 2x -7y) -7y( 2x-7y)

= 4x² -14xy -14xy + 49y²

= 4x² - 28xy +49y²

3. (a-3)(a+3)

a( a+3) -3( a+3)

= a² +3a -3a -9

= a² - 9

4. (2a-b)² = (2a-b)(2a-b)

2a( 2a-b) -b( 2a-b)

= 4a² -2ab -2ab +b²

= 4a² - 4ab + b²

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