The mean of eight numbers is 47. The seven numbers are 50, 27, 45, 72, 67, 32 and 38. What is the eighteenth number? A. 49 C. 45 B. 47 D. 50​

Answer:

V = (1/3)π(8^2)(16) = 1,024π/3 cubic meters

= 1,072.33 cubic meters

Since 3.14 is used for π here:

V = (1/3)(3.14)(8^2)(16) =

1,071.79 cubic meters

A cable hangs between two poles 10 yards apart. The cable forms a catenary that can be modeled 5. We need to integrate the function over this interval.

Here's a step-by-step explanation:

1. Write down the integral: ∫[-5, 5] (10cosh(x/10) - 8) dx
2. Compute the antiderivative of the function: 100sinh(x/10) - 8x + C (C is the constant of integration)
3. Evaluate the antiderivative at the limits of integration: [100sinh(5/10) - 8(5)] - [100sinh(-5/10) - 8(-5)]
4. Simplify the expression: [100sinh(1/2) - 40] - [100sinh(-1/2) + 40]
5. Calculate the numerical value: [100(1.1752) - 40] - [100(-1.1752) + 40]
6. Perform the arithmetic: [117.52 - 40] - [-117.52 + 40] = 77.52 + 77.52
7. Add the results: 155.04

So, the area under the catenary between a = -5 and x = 5 is approximately 155.04 square yards.

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The particular solution satisfying the given initial conditions is: y(t) = 2et - e-t.

To find a particular solution, we first need to find the general solution. Since y1(t), y2(t), and y3(t) are linearly independent solutions, the general solution can be written as y(t) = c1y1(t) + c2y2(t) + c3y3(t), where c1, c2, and c3 are constants to be determined.

Using the characteristic equation, we can find that the characteristic roots are r1 = 1, r2 = -1, and r3 = 2. Therefore, the three linearly independent solutions are y1(t) = et, y2(t) = e-t, and y3(t) = e2t.

Next, we can use the initial conditions to solve for the constants. From y(0) = 1, we have c1 + c2 + c3 = 1. From y'(0) = 2, we have c1 - c2 + 2c3 = 2. From y''(0) = 0, we have c1 + c2 + 4c3 = 0.

Solving these equations simultaneously, we get c1 = 1/2, c2 = -1/2, and c3 = 0. Therefore, the general solution is y(t) = (1/2)et - (1/2)e-t.

Finally, to find the particular solution satisfying the given initial conditions, we add the complementary function y(t) to a particular solution yp(t) and determine the constants in yp(t) to satisfy the initial conditions. Since y(t) = (1/2)et - (1/2)e-t is the complementary function, we can guess a particular solution of the form yp(t) = Aet. Then, yp'(t) = Aet and yp''(t) = Aet.

Substituting yp(t), yp'(t), and yp''(t) into the differential equation and simplifying, we get 3Aet = 0, which implies A = 0. Therefore, the particular solution is yp(t) = 0, and the final solution is y(t) = y(t) + yp(t) = (1/2)et - (1/2)e-t + 0 = 2et - e-t.

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The solution to the initial value problem is: y(x) = 2 * e^(4x) + x * e^(4x)

To find a general solution to the differential equation y′′ - 4y′ + 29y = 0, we first note that this is a second-order linear homogeneous differential equation with constant coefficients. The characteristic equation is given by:

r^2 - 4r + 29 = 0

Solving for r, we get a quadratic equation with complex roots:

r = 2 ± 5i

Now, we use these roots to form a general solution:

y(x) = e^(2x) (C1 * cos(5x) + C2 * sin(5x))

For the initial value problem y′′ - 8y′ + 16y = 0, y(0) = 2, y′(0) = 9, we again have a second-order linear homogeneous differential equation. The characteristic equation is:

r^2 - 8r + 16 = 0

This time, we get a repeated real root:

r = 4

So, the general solution is:

y(x) = C1 * e^(4x) + C2 * x * e^(4x)

Now, we apply the initial conditions:

y(0) = 2 = C1 * e^(0) + C2 * 0 * e^(0) => C1 = 2

y′(x) = C1 * 4 * e^(4x) + C2 * (e^(4x) + 4x * e^(4x))

y′(0) = 9 = C1 * 4 * e^(0) + C2 * e^(0) => 9 = 2 * 4 + C2 => C2 = 1

Thus, the solution to the initial value problem is:

y(x) = 2 * e^(4x) + x * e^(4x)

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The solution to the differential equation with the given initial condition is y = (√([tex]x^2 + 1[/tex]) - 3x) / 2.

We can separate the variables and integrate both sides as follows:

∫ 1/(9x - 4y√([tex]x^2 + 1[/tex])) dy = ∫ dx

Let u = [tex]x^2 + 1[/tex], then du/dx = 2x and we have:

∫ 1/(9x - 4y√([tex]x^2 + 1[/tex])) dy = ∫ 1/u * (du/dx) dy

∫ 1/(9x - 4y√([tex]x^2 + 1[/tex])) dy = ∫ 2x/([tex]9x^2 - 4y^2u[/tex]) du

We can now integrate both sides with respect to their respective variables:

(1/4)ln|9x - 4y√([tex]x^2[/tex] + 1)| + C1 = ln|u| + C2

(1/4)ln|9x - 4y√([tex]x^2[/tex] + 1)| + C1 = ln|x^2 + 1| + C2

where C1 and C2 are constants of integration.

Using the initial condition y(0) = 4, we can substitute x = 0 and y = 4 into the above equation to solve for C1 and C2:

(1/4)ln|36| + C1 = ln|1| + C2

C1 = C2 - (1/4)ln(36)

Substituting this into the above equation, we get:

(1/4)ln|9x - 4y√([tex]x^2 + 1[/tex])| = ln|[tex]x^2 + 1[/tex]| - (1/4)ln(36)

Taking the exponential of both sides, we get:

|9x - 4y√([tex]x^2 + 1)|^{(1/4)[/tex] = |[tex]x^2 + 1|^{(1/4)[/tex] / 6

Squaring both sides and simplifying, we get:

y = (√([tex]x^2 + 1[/tex]) - 3x) / 2

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Answer:

The answer is -3.

(Hope this helps)

Step-by-step explanation:


The diameter of a nucleus is much smaller than the diameter of a proton. In fact, it is about 10,000 times smaller!

If we imagine the diameter of a proton to be equal to 1 unit, then the diameter of a nucleus would be equal to 0.0001 units.

To write this in scientific notation, we can express it as 1 x 10^-3 units.

So, the diameter of a proton times 10 raised to what power is equivalent to the diameter of a nucleus?

The answer is -3.

The diameter of a proton times 10 raised to the power of -1 is equivalent to the diameter of a nucleus.

The diameter of a proton is approximately 1.75 x 10-15 meters, and the diameter of a typical atomic nucleus is approximately 1 x 10-14 meters.

To find the power to which we need to raise 10 in order to equate the two diameters, we can set up an equation:

1.75 x 10-15 = 1 x 10-14 * 10x

Dividing both sides of the equation by 1 x 10-14, we get:

x = -1

Therefore, the diameter of a proton times 10 raised to the power of -1 is equivalent to the diameter of a nucleus.

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(a) Divergence at the indicated point is positive. (b) Divergence at the indicated point is zero. (c) Divergence at the indicated point is negative.

To find the divergence of each vector field at the indicated point, we will first calculate the divergence of each field and then evaluate it at the given point.
(a) The vector field is given as F = xi + yj.
The divergence of a 2D vector field F = P(x,y)i + Q(x,y)j is calculated as:
div(F) = (∂P/∂x) + (∂Q/∂y)
For this vector field, P(x,y) = x and Q(x,y) = y. So:
div(F) = (∂x/∂x) + (∂y/∂y) = 1 + 1 = 2
The divergence at the indicated point is positive.
(b) The vector field is given as F = yi.
For this vector field, P(x,y) = y and Q(x,y) = 0. So:
div(F) = (∂y/∂x) + (∂0/∂y) = 0 + 0 = 0
The divergence at the indicated point is zero.
(c) The vector field is given as F = yi - yj.
For this vector field, P(x,y) = y and Q(x,y) = -y. So:
div(F) = (∂y/∂x) + (∂(-y)/∂y) = 0 - 1 = -1
The divergence at the indicated point is negative.

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The partial derivative of the function with respect to y is: ∂/∂y [(8y-8x)/(9x+8y)] = 8/(9x+8y) - (64x)/(9x+8y)^2To find the partial derivatives of the function (8y-8x)/(9x+8y), we need to take the derivative with respect to each variable separately.

First, let's find the partial derivative with respect to x. To do this, we treat y as a constant and differentiate the function with respect to x:
(8y-8x)/(9x+8y)
= (8y)/(9x+8y) - (8x)/(9x+8y)
Using the quotient rule, we can simplify this expression:
= (-8y(9))/((9x+8y)^2) - 8/(9x+8y)
Simplifying further, we get:
= (-72y)/(9x+8y)^2 - 8/(9x+8y)
Therefore, the partial derivative of the function with respect to x is:

∂/∂x [(8y-8x)/(9x+8y)] = (-72y)/(9x+8y)^2 - 8/(9x+8y)
Now, let's find the partial derivative with respect to y. To do this, we treat x as a constant and differentiate the function with respect to y:
(8y-8x)/(9x+8y)
= (8y)/(9x+8y) - (8x)/(9x+8y)
Using the quotient rule again, we get:
= 8/(9x+8y) - (8x(8))/((9x+8y)^2)
Simplifying further, we get:
= 8/(9x+8y) - (64x)/(9x+8y)^2
Therefore, the partial derivative of the function with respect to y is:
∂/∂y [(8y-8x)/(9x+8y)] = 8/(9x+8y) - (64x)/(9x+8y)^2
And that's how we find the partial derivatives of the function (8y-8x)/(9x+8y) using the quotient rule and differentiation with respect to each variable separately.

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The rate of change of function given by the table is equal to 1.

To find the rate of change of a function given by a table, we need to look at the change in the output (y) with respect to the change in the input (x). In this table, we can see that as x increases by 1, y increases by 1. Therefore, the rate of change of the function is 1/1 or simply 1.

This means that for every unit increase in x, there is a corresponding unit increase in y. Another way to interpret this is that the function has a constant rate of change, which means that it is a linear function. We can verify this by plotting the points on a graph and seeing if they form a straight line.

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The volume of the solid of revolution is 1/3πb([tex]16b^2 - 24ab^2[/tex]).

To find the volume of the region e that lies between the paraboloid [tex]z = 4y^2[/tex] and the cone z = [tex]2sx^2 - y^2,[/tex]

we need to first find the intersection point between the two curves and then use the formula for the volume of a solid of revolution.

The intersection point between the two curves is where the paraboloid and the cone intersect. To find this intersection point, we can set the two equations equal to each other and solve for y:

[tex]4y^2 = 2sx^2 - y^2[/tex]

Multiplying both sides by 2sx and then subtracting [tex]4y^2[/tex] from both sides:

[tex]2sx^2 = 4y^2 - y^2[/tex]

Simplifying the left side:

[tex]2sx^2 = 3y^2[/tex]

Dividing both sides by 2sx:

[tex]y^2 = 3/s[/tex]

Now we can find the intersection point using the formula for the intersection of a paraboloid and a cone:

(x/s, y/s) = (a, b)

where (a, b) is the vertex of the cone and (x/s, y/s) is the point where the paraboloid and the cone intersect.

To find a and b, we need to solve for x and y in terms of s:

x = 2by

y = 2ax

Substituting these equations into the formula for the vertex of the cone:

[tex]a = s^2/4[/tex]

[tex]b = s^2/2[/tex]

Now we can substitute these values into the formula for the intersection point:

[tex](x/s, y/s) = (s^2/4, s^2/2)[/tex]

Solving for s:

s = 2(x/b + y/a)

Substituting the values we found earlier:

s = 2((2by)/(2ax) + (2ax)/(2by))

Simplifying:

s = (2b + 2a)/(2a + 2b)

s = (2b + 2a)/(2(b + a))

s = (2b + 2a)/3

Now we can substitute this value of s back into the formula for the intersection point:

[tex](x/s, y/s) = (s^2/4, s^2/2)[/tex]

Solving for x and y:

[tex]x = s^2/4[/tex]

[tex]y = s^2/2[/tex]

Therefore, the intersection point of the paraboloid and the cone is ([tex]s^2/4, s^2/2)[/tex], and the volume of the solid of revolution is:

[tex]V = 1/3π s^3[/tex]

Plugging in the value of s:

[tex]V = 1/3π [(2b + 2a)/3]^3[/tex]

Simplifying:

V = 1/3π (2b + 2a)^3

Plugging in the values we found earlier:

V = 1/3π [(2(2b) + 2(2a))^3]

Simplifying:

[tex]V = 1/3π (8b + 8a)^3[/tex]

[tex]V = 1/3π (8b^3 + 8ab^2 + 8a^3 + 8ab^3)[/tex]

[tex]V = 1/3π (8(b^3 + 3ab^2) + 8a(b^2 + 3a^2))[/tex]

[tex]V = 1/3π (8b^3 + 24ab^2 + 8a(b^2 + 2a^2))[/tex]

[tex]V = 1/3π (8b^3 + 24ab^2 + 16a^2b^2)[/tex]

[tex]V = 1/3π (8b^3 + 24ab^2 + 48ab^2)[/tex]

[tex]V = 1/3π (2b^3 + 24ab^2 + 48ab^2)[/tex]

Finally, we can simplify the expression for the volume:

[tex]V = 1/3π [(2b + 2a)^3 - (2b - 2a)^3][/tex]

Simplifying:

V = 1/3π [(2b + 2a)^3 - (2b - 2a)^3]

V = 1/3π ([tex]4b^3 + 12ab^2 + 16ab^2 - 4b^3 - 12ab^2 - 16ab^2[/tex])

V = 1/3π ([tex]8b^3 + 24ab^2 - 4b^3 - 12ab^2 - 16ab^2[/tex])

V = 1/3π ([tex]16b^3 - 24ab^2[/tex])

V = 1/3π (b([tex]16b^2 - 24ab^2[/tex]))

V = 1/3π b([tex]16b^2 - 24ab^2[/tex])

Therefore, the volume of the solid of revolution is 1/3πb([tex]16b^2 - 24ab^2[/tex]).  

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The mass of the solid Q of density rho = k is k(8π/√e).

To find the mass of the solid Q with density rho, we can use the triple integral formula in cylindrical coordinates. The density function rho is given as a constant k, which means it is independent of the coordinates. Therefore, the mass of Q is simply the product of its volume and density.

First, we need to determine the limits of integration in cylindrical coordinates. Since the solid Q is defined in terms of x, y, and z, we need to express these variables in terms of cylindrical coordinates.

In cylindrical coordinates, x = r cos(theta), y = r sin(theta), and z = z. Also, the condition x2 + y2 ≤ 16 corresponds to the cylinder of radius 4 in the xy-plane.

Thus, the limits of integration become:
0 ≤ z ≤ 8e^(-r^2)
0 ≤ r ≤ 4
0 ≤ theta ≤ π/2

Now, we can set up the integral to find the volume of Q:
V = ∭Q dV = ∫₀²π ∫₀⁴ ∫₀^(8e^(-r^2)) r dz dr dθ

Evaluating this integral, we get V = 8π/√e. Therefore, the mass of Q is:
M = ρV = kV = k(8π/√e).

The mass of the solid Q of density rho = k is k(8π/√e).

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The solution is, 52 ft is the perimeter of the base of the pyramid.

Here, we have,

Given that:

We have an pyramid with square base.

Area of base of the square pyramid = 169

To find:

Perimeter of the base of pyramid = ?

Solution:

First of all, let us have a look at the formula of area of a square shape.

Area = side * side

Let the side be equal to  ft.

Putting the given values in the formula:

169 = a^2

so, a = 13 ft

Now, let us have a look at the formula for perimeter of square.

Perimeter of a square shape = 4  Side

Perimeter = 4 * 13 = 52ft

The solution is, 52 ft is the perimeter of the base of the pyramid.

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complete question:

A pyramid has a square base with an area of 169 ft2. What is the perimeter of the base of the pyramid? A pyramid has a square base with an area of 169 ft2. What is the perimeter of the base of the pyramid?

The number of solutions to x₀ + x₁ + ... + [tex]x_{k}[/tex] = n with each value of x to be a non-negative integer xₐ is (n +  k).

Solved using the technique of stars and bars, also known as balls and urns.

Imagine you have n identical balls and k+1 distinct urns.

Distribute the balls among the urns such that each urn has at least one ball.

First distribute one ball to each urn, leaving you with n - (k+1) balls to distribute.

Then use k bars to separate the balls into k+1 groups, with the number of balls in each group corresponding to the value of xₐ.

For example, if the first k bars separate x₀ balls from x₁ balls, the second k bars separate x₁ balls from x₂ balls, and so on, with the last k bars separating [tex]x_{k-1}[/tex] balls from [tex]x_{k}[/tex] balls.

The number of ways to arrange n balls and k bars is (n + k) choose k, or (n +k) choose n.

This is the number of solutions to x₀ + x₁ + ... + [tex]x_{k}[/tex] = n, where each xₐ is a non-negative integer.

Therefore, the number of solutions to x₀ + x₁ + ... + [tex]x_{k}[/tex] = n with non-negative integer xₐ is (n +  k).

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Answer:

To graph a quadratic function with a set of {-1,3}, we need to find the equation of the function first. Since we are given two points, we can use them to form a system of equations and solve for the coefficients of the quadratic function.

Let's assume that the quadratic function has the standard form:

f(x) = ax^2 + bx + c

Using the given points (-1, 0) and (3, 0), we can set up the following system of equations:

a(-1)^2 + b(-1) + c = 0

a(3)^2 + b(3) + c = 0

Simplifying each equation, we get:

a - b + c = 0

9a + 3b + c = 0

Now we can solve this system of equations using any method we prefer. For example, we can use substitution to eliminate one of the variables. Solving for c in the first equation, we get:

c = b - a

Substituting this expression for c into the second equation, we get:

9a + 3b + (b - a) = 0

Simplifying this equation, we get:

8a + 4b = 0

Dividing both sides by 4, we get:

2a + b = 0

Solving for b in terms of a, we get:

b = -2a

Substituting this expression for b into c = b - a, we get:

c = -3a

Therefore, the quadratic function can be written as:

f(x) = ax^2 - 2ax - 3a

To find the vertex of the parabola, we can use the formula:

x = -b/2a

Substituting a = 1 and b = -2a, we get:

x = -(-2a)/(2a) = 1

To find the y-coordinate of the vertex, we can substitute x = 1 into the function f(x):

f(1) = a(1)^2 - 2a(1) - 3a = -a

Therefore, the vertex of the parabola is at the point (1, -a).

To find the x-intercepts, we can set f(x) = 0 and solve for x:

ax^2 - 2ax - 3a = 0

Dividing both sides by a, we get:

x^2 - 2x - 3 = 0

Factoring this quadratic equation, we get:

(x - 3)(x + 1) = 0

Therefore, the x-intercepts of the parabola are at x = 3 and x = -1.

To find the y-intercept, we can substitute x = 0 into the function f(x):

f(0) = a(0)^2 - 2a(0) - 3a = -3a

Therefore, the y-intercept of the parabola is at the point (0, -3a).

Finally, to find the reflection of the y-intercept in the axis of symmetry (which is x = 1), we can use the formula:

x' = 2p - x

where p is the x-coordinate of the vertex. Substituting p = 1 and x = 0, we get:

x' = 2(1) - 0 = 2

Therefore, the reflection of the y-intercept in the axis of symmetry is at the point (2, -3a).

To summarize, the quadratic function that passes through the points (-1, 0) and (3, 0) can be written as f(x) = ax^2 - 2ax - 3a, where a is any non-zero constant. The vertex of the parabola is at the point (1, -a), the x-intercepts are at x = -1 and x = 3, the y-intercept is at the point (0, -3a), and the reflection of the y-intercept in the axis of symmetry is at the point (2, -3a).

(a) Using the formula for nth partial sum s2 = a1 + a2, we can find a2, a3, a4 and solving for the next term in the series.

(b) The sum of series is 7.

(a) To find an for n > 1, we can use the formula for the nth partial sum:

sn = 7n-5/2n + 5

Substituting n = 1 gives:

s1 = 7(1) - 5/2(1) + 5 = 6.5

We can then use this value to find a2:

s2 = 7(2) - 5/2(2) + 5 = 10

Using the formula for the nth partial sum, we can write:

s2 = a1 + a2 = 6.5 + a2

Solving for a2 gives:

a2 = s2 - 6.5 = 10 - 6.5 = 3.5

Similarly, we can find a3, a4, and so on by using the formula for the nth partial sum and solving for the next term in the series.

(b) To find the sum of the series sigma n = 1 to infinity an, we can take the limit as n approaches infinity of the nth partial sum:

lim n -> infinity sn = lim n -> infinity (7n-5/2n + 5)

We can use L'Hopital's rule to evaluate this limit:

lim n -> infinity (7n-5/2n + 5) = lim n -> infinity (7 - 5/(n ln 2)) = 7

Therefore, the sum of the series is 7.

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To determine the value of the problem, if we get the following result, then the equation will be:

y = 30, x = 3.

To solve the initial value problem y = 3 with y0 = 21, we need to find the equation for y. Since the derivative of y is constant at 3, we can integrate both sides to get:

y = 3x + C

where C is a constant of integration. To determine the value of C, we use the initial condition y0 = 21:

21 = 3(0) + C
C = 21

So the equation for y is:

y = 3x + 21
4. Apply the initial value y(0) = 21: 21 = (3/2)(0)^2 + C => C = 21.

5. Substitute C back into the equation: y = (3/2)t^2 + 21.

Now, we need to determine the value of t when y = 30:

6. Set y equal to 30: 30 = (3/2)t^2 + 21.

7. Solve for t: (3/2)t^2 = 9 => t^2 = 6 => t = √6.

To find the value of x when y = 30, we plug in y = 30 and solve for x:
30 = 3x + 21
9 = 3x
x = 3

Therefore, when y = 30, x = 3.

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The derivative of y = ln(4x) with respect to x is dy/dx = 1/x.

To find the derivative of y with respect to x in this problem, we will use the rule for derivatives of logarithms.
12. y = ln(3x + x)
Using the chain rule, we can rewrite this as:
y = ln(4x)
Then, taking the derivative:
y' = (1/4x) * 4 = 1/x
So, the derivative of y with respect to x is 1/x.

Let's consider the given function y = ln(3x + x), which can be simplified as y = ln(4x).

To find the derivative of y with respect to x, we'll use the chain rule for differentiation. The chain rule states that the derivative of a composite function is the derivative of the outer function times the derivative of the inner function.

In this case, the outer function is ln(u) and the inner function is u = 4x.

Step 1: Find the derivative of the outer function with respect to u:
dy/du = 1/u

Step 2: Find the derivative of the inner function with respect to x:
du/dx = 4

Step 3: Apply the chain rule (dy/dx = dy/du * du/dx):
dy/dx = (1/u) * 4

Step 4: Substitute the inner function (u = 4x) back into the derivative:
dy/dx = (1/(4x)) * 4

Step 5: Simplify the expression:
dy/dx = 4/(4x) = 1/x

So, the derivative of y = ln(4x) with respect to x is dy/dx = 1/x.

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The mean number of tomatoes for the Ultra Boy tomato plant is calculated by adding up all the quantities and dividing by the total number of plants, which is 10 in this case. So, the mean is (32+46+51+43+42+56+28+41+39+53)/10 = 43.1 tomatoes per plant.

To find the median number of tomatoes, we need to first arrange the quantities in numerical order: 28, 32, 39, 41, 42, 43, 46, 51, 53, 56. The median is the middle number in this list, which is 43.

Therefore, the median number of tomatoes for the Ultra Boy tomato plant is 43.

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The final sorted list is [1, 2, 3, 4, 5, 6]. We start with the first element (6) and consider it as a sorted list. The next element (2) is compared with the first element and swapped to get [2, 6, 3, 1, 5, 4].

Step 1: The next element (3) is compared with 6 and inserted before it to get [2, 3, 6, 1, 5, 4].
Step 2: The next element (1) is compared with 6 and inserted before it to get [2, 3, 1, 6, 5, 4]. Then, it is compared with 3 and 2 and inserted in the correct position to get [1, 2, 3, 6, 5, 4].
Step 3: The next element (5) is compared with 6 and inserted before it to get [1, 2, 3, 5, 6, 4]. Then, it is compared with 3 and 2 and inserted in the correct position to get [1, 2, 3, 5, 6, 4].
Step 4: The next element (4) is compared with 6 and inserted before it to get [1, 2, 3, 5, 4, 6]. Then, it is compared with 3, 2, and 1 and inserted in the correct position to get [1, 2, 3, 4, 5, 6].
Thus, the final sorted list is [1, 2, 3, 4, 5, 6].

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Answer:

Step-by-step explanation: Let the numbers be X and Y

Given : twice the number added to second number : 2x+y= -8 ==> (1)

Difference of the two numbers : x-y=-2  ==> (2)

(2)*2 = 2x-2y=-4

-(1)    =-2x- y = 8   ( adding (2)*2 ,-(1) equations)

______________

            0-3y=4

hence y=-4/3 and from equation (2) : x=-2+y ==>x= -4/3 -2 = -10/3

The two numbers are -4/3 and -10/3

From the information given,

Let the numbers be x and y, we have;

2x + y = -8

x - y = - 2

Now, from equation 2, make 'x' the subject of formula

x= -2 + y

Substitute the value of x into equation 1, we get;

2x + y = -8

2(-2 + y) + y = -80

expand the bracket

-4 + 2y + y = -8

collect the like terms

3y = -4

y = -4/3

Substitute the value

x = -2 + (-4)/3

add the values

x = -2 -4/3

x = -6 - 4 /3

x = -10/3

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To find f'(-1), we need to take the derivative of f(x) and then evaluate it at x = -1. Using the chain rule, we get: f'(x) = 8x + 8 / (4x^2 + 8x + 5), f'(-1) = 8(-1) + 8 / (4(-1)^2 + 8(-1) + 5), f'(-1) = -8 + 8 / 1, f'(-1) = 0. So, f'(-1) = 0. We don't need to round to 3 decimal places in this case since the answer is an integer.

To find f'(-1) for f(x) = ln(4x^2 + 8x + 5), we first need to find the derivative of the function with respect to x, and then evaluate it at x = -1. Here's the step-by-step process:

1. Identify the function: f(x) = ln(4x^2 + 8x + 5)
2. Differentiate using the chain rule: f'(x) = (1 / (4x^2 + 8x + 5)) * (d(4x^2 + 8x + 5) / dx)
3. Find the derivative of the inner function: d(4x^2 + 8x + 5) / dx = 8x + 8
4. Substitute the derivative of the inner function back into f'(x): f'(x) = (1 / (4x^2 + 8x + 5)) * (8x + 8)
5. Evaluate f'(-1): f'(-1) = (1 / (4(-1)^2 + 8(-1) + 5)) * (8(-1) + 8)
6. Simplify the expression: f'(-1) = (1 / (4 - 8 + 5)) * (-8 + 8)
7. Continue simplifying: f'(-1) = (1 / 1) * 0
8. Final answer: f'(-1) = 0

Since f'(-1) is an integer, there is no need to round to any decimal places f'(-1) = 0.

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(a) f(x) is increasing on the interval (-3, 2) and decreasing on the intervals (-∞, -3) and (2, ∞).

(b) The local maximum value of f(x) is 81 at x = -3 and the local minimum value of f(x) is -64 at x = 2.

(c) The interval of concavity is (-∞, -1/2) for concave down and (-1/2, ∞) for concave up, and the inflection point is (-1/2, f(-1/2)) = (-1/2, -27).

(a) To find the intervals on which f(x) is increasing or decreasing, we need to find the first derivative of f(x) and determine where it is positive or negative.

f'(x) = 6x^2 + 6x - 36 = 6(x^2 + x - 6) = 6(x + 3)(x - 2)

The critical points of f(x) occur at x = -3 and x = 2.

If x < -3, then f'(x) < 0, so f(x) is decreasing on (-∞, -3).

If -3 < x < 2, then f'(x) > 0, so f(x) is increasing on (-3, 2).

If x > 2, then f'(x) < 0, so f(x) is decreasing on (2, ∞).

Therefore, f(x) is increasing on the interval (-3, 2) and decreasing on the intervals (-∞, -3) and (2, ∞).

(b) To find the local maximum and minimum values of f(x), we need to examine the critical points of f(x) and the endpoints of the intervals we found in part (a).

f(-3) = 81, f(2) = -64, and f(x) approaches -∞ as x approaches -∞ or ∞.

Therefore, the local maximum value of f(x) is 81 at x = -3 and the local minimum value of f(x) is -64 at x = 2.

(c) To find the intervals of concavity and the inflection points of the function, we need to find the second derivative of f(x) and determine where it is positive or negative.

f''(x) = 12x + 6

The inflection point occurs at x = -1/2, where f''(x) changes sign from negative to positive.

If x < -1/2, then f''(x) < 0, so f(x) is concave down on (-∞, -1/2).

If x > -1/2, then f''(x) > 0, so f(x) is concave up on (-1/2, ∞).

Therefore, the interval of concavity is (-∞, -1/2) for concave down and (-1/2, ∞) for concave up, and the inflection point is (-1/2, f(-1/2)) = (-1/2, -27).

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The percentage of the population that does not meet US military enlistment standards is 15.87%.

The provided information is:

Let X represent the adult IQ test results, which are normally distributed with a mean (μ) of 100 and a standard deviation (Σ) of 15.

In addition, the US military requires a minimum IQ of 85.

As a result, the likelihood that a randomly picked adult will not fulfill US military enrollment criteria is: P(X < 85)

The probability can also be written as:

P(X < x) = P(Z < (x - μ)/Σ)

Now we take X = x

Thus,

P(X = 85)

=P(Z) = (85 - 100)/15)

= P(Z) = (-15/15)

=P(Z) =  (-1)

Taking the probability of Z = -1, using the standard normal distribution table  to find the area to the left of a z-score of -1 is approximately 0.1587.

Thus, the required probability is 0.1587. So the percentage of the population does not meet US military enlistment standards is 15.87%.

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The probability that 7 mice are required to find 2 that have contracted the disease is 0.0002837 or approximately 0.028%.

The probability of contracting the disease is 1/11 for each mouse inoculated. Therefore, the probability that 2 mice will contract the disease in a row is (1/11) x (1/11) = 1/121.

To find the probability that 7 mice are required, we need to use the concept of binomial distribution.

The probability of getting 2 successful outcomes (i.e., mice that contract the disease) in 7 trials (i.e., inoculations) can be calculated using the binomial formula: P(2 successes in 7 trials) = (7 choose 2) x (1/121)^2 x (120/121)^5 = 21 x 1/14641 x 2482515744/1305167425 = 21 x 0.0000069 x 1.9037 = 0.0002837 or approximately 0.028%.

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The distance between the two points (0,7) and (−6,3) is approximately 7.2

Here, we have,

We are asked to find the distance between two points. We will calculate the distance using the following formula;

Formula: distance= √(x_2-x_1)²+(y_2-y_1)²

In this formula, (x₁ , y₁) and (x₂ , y₂) are the 2 points.

We are given the points ( 0 , 7 ) and ( − 6 , 3 ) .

If we match the value and the corresponding variable, we see that:

x₁= 0      

y₁= 7        

x₂= -6    

y₂= 3

Substitute the values into the formula.

distance= √(x_2-x_1)²+(y_2-y_1)²

Solve inside the parentheses.

(-6 - 0)= -6

(3 - 7)=  -4

Solve the exponents. Remember that squaring a number is the same as multiplying it by itself.

(-6)²= 36

(-4)²= 16

Add.

36 + 16 = 52

Take the square root of the number.

d = 7.21

Round to the nearest tenth.

The distance between the two points (0,7) and (−6,3) is approximately 7.2

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The roots of the quadratic equation is real.

We know from the discriminant method that

If D >0 then equation have real and distinct roots.

If D =0 then equation have two equal roots.

If D<0 then equation have imaginary roots.

Here, D = 625 > 0

Then the equation two distinct real roots.

Thus, the roots of the quadratic equation is real.

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To determine the angle between ab¯¯¯¯¯¯¯¯ and ac¯¯¯¯¯¯¯¯, we first need to find the vectors associated with those line segments.

The vector associated with ab¯¯¯¯¯¯¯¯ is:

b - a = (2,1) - (9,2) = (-7,-1)

The vector associated with ac¯¯¯¯¯¯¯¯ is:

c - a = (4,9) - (9,2) = (-5,7)

To find the angle between these two vectors, we can use the dot product formula:

a · b = ||a|| ||b|| cos(θ)

Where a · b is the dot product of vectors a and b, ||a|| and ||b|| are the magnitudes of the vectors, and θ is the angle between the vectors.

In this case, we have:

(-7,-1) · (-5,7) = ||(-7,-1)|| ||(-5,7)|| cos(θ)

(44) = √50 √74 cos(θ)

Simplifying:

cos(θ) = 44 / (2√1850)

cos(θ) = 0.3913

Taking the inverse cosine:

θ ≈ 67.15 degrees

Therefore, the angle between ab¯¯¯¯¯¯¯¯ and ac¯¯¯¯¯¯¯¯ is approximately 67.15 degrees.

To find the angle between vectors AB and AC, we'll first find the vectors AB and AC, then calculate the dot product and magnitudes, and finally use the cosine formula.

1. Find vectors AB and AC:
AB = B - A = (2 - 9, 1 - 2) = (-7, -1)
AC = C - A = (4 - 9, 9 - 2) = (-5, 7)

2. Calculate the dot product and magnitudes:
Dot product: AB • AC = (-7)(-5) + (-1)(7) = 35 - 7 = 28
Magnitude of AB = √((-7)^2 + (-1)^2) = √(49 + 1) = √50
Magnitude of AC = √((-5)^2 + 7^2) = √(25 + 49) = √74

3. Use the cosine formula to find the angle θ:
cos(θ) = (AB • AC) / (||AB|| ||AC||) = 28 / (√50 * √74)
θ = arccos(28 / (√50 * √74))

You can use a calculator to find the arccos value and get the angle θ in degrees.

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The end behavior of the function f(x) is falling to the left and rising to the right. So, the correct answer is D).

To determine the end behavior of the function f(x) = -x⁴ + 4x + 37, we need to look at what happens to the function as x becomes very large in the positive and negative directions.

As x becomes very large in the negative direction (i.e., x approaches negative infinity), the -x⁴ term will become very large in magnitude and negative. The 4x and 37 terms will become insignificant in comparison. Therefore, the function will be falling to the left.

As x becomes very large in the positive direction (i.e., x approaches positive infinity), the -x⁴ term will become very large in magnitude but positive. The 4x and 37 terms will become insignificant in comparison. Therefore, the function will be rising to the right.

Therefore, the correct answer is falling to the left and rising to the right and option is D).

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