Correlation Coefficients problem. Image attached.

A. 10
B. 8
C. 6
D 4

Answer:

D

Step-by-step explanation:

So you start with $2.65 and a variable y. What we will do is work without the dollar and keep it for the end as it quite disturbs and work our way while keeping the y. So first we have 2.65. Now it rose by y so. The price = 2.65 + y. Then it dropped by 0.15. So 2.65 + y - 0.15. Here you see we have like terms so we reduce and get 2.50 + y. Now it rose by 0.05. So 2.50 + y + 0.05. Again, like terms, reduce. 2.55 + y. There you go with the answer.

Final answer:

The current price of milk, after it first increased by an unknown amount y, then decreased by $0.15, and finally increased by $0.05, is represented by the expression $2.55 + y, which is Option D.

Explanation:

The question asks us to calculate the current price of a gallon of milk after a series of price changes. The original price was $2.65. After a hurricane, the price increased by y dollars. Subsequently, the price dropped by $0.15, and then again rose by $0.05.

To find the new price, we start with the original price and apply the changes step by step:

Original price: $2.65

Price after hurricane increase: $2.65 + y

Price after $0.15 drop: ($2.65 + y) - $0.15 = $2.50 + y

Price after $0.05 rise: ($2.50 + y) + $0.05 = $2.55 + y

Hence, the correct answer representing the current price of milk after these changes is Option D) $2.55 + y.

ANSWER

[tex] 96 \sqrt{3} {cm}^{2} [/tex]

EXPLANATION

The area of a regular polygon is

[tex]Area= \frac{1}{2} ap[/tex]

where 'a' is the apothem of the polygon and 'p' is the perimeter of the polygon.

From the diagram,

[tex] \sin(60) = \frac{a}{8} [/tex]

a=8sin(60)

[tex]a = 4 \sqrt{3} [/tex]

[tex] \cos(60) = \frac{l}{8} [/tex]

[tex]l = 8 \cos(60) [/tex]

[tex]l = 4[/tex]

The length of one side of the hexagon is 2×4=8.

The perimeter of the hexagon is

p=6×8=48

The area of the hexagon is

[tex] = \frac{1}{2} \times 4 \sqrt{3} \times 48[/tex]

[tex] = 96 \sqrt{3} {cm}^{2} [/tex]

Answer:

y=5,902,060*(.957)^t

Step-by-step explanation:

Since the original amount would be decreasing and it's an exponential one, hence the "every year", we can determine that it's an exponential decay equation.

The exponential delay equation is y=A*(1-r)^t. The y is the remaining amount, A is the original amount, r is the rate in decimal form, and t is for years. "1-r" is for decreasing rates and "1+r" is for increasing rates.

First thing we need to do is turn the rate, 4.3%, from a percentage to a decimal. You can do this by moving the decimal two places to the right, which gives you 0.043.

Now plug the numbers into the equation.

y=5,902,060*(1-0.043)^t

Simplify what's inside the parenthesis and get your final equation.

y=5,902,060*(.957)^t

Answer:

F = 5,902,060(0.957)[tex]F = 5,902,060(0.957)^{t}[/tex]

Step-by-step explanation:

Answer:

−3(1.5n−1)−3(1.5n−1)

Step-by-step explanation:

To factor the expression −4.5n+3−4.5n+3, find the GCF between each term.  Using the GCF 3, divide each term by 3 and rewrite it as −3(1.5n−1)−3(1.5n−1).

The other options are not the factors because they give the wrong signs of at least one term in the expression.

−1.5(−3n+2)−1.5(−3n+2)  = 4.5n -3 + 4.5n - 3

−1.5(3n+2)−1.5(3n+2)  = -4.5n - 3 - 4.5n - 3

−3(1.5n+1) = -4.5n - 3

Answer:

60°

Step-by-step explanation:

The radius of the circle is given as 7 ( centre of circle to point C )

The other radius is also 7 ( from centre to point D)

CD = 7

The triangle is therefore equilateral ( all 3 sides = 7 )

The angles of an equilateral triangle are equal and measure 60°

Hence mCD = 60°

For this case we have the following equation:

[tex]9 (w + 7) = 27[/tex]

To solve we follow the steps below:

We apply Distributive Property to the terms of parentheses:

[tex]9w + 63 = 27[/tex]

We apply Subtraction Property of equality by subtracting 63 from both sides of the equation:

[tex]9w + 63-63 = 27-63\\9w = -36[/tex]

We apply Division Property of equality by dividing by 9 on both sides of the equation:

[tex]\frac {9w} {9} = \frac {-36} {9}[/tex]

simplifiying

w = -4

Answer:

[tex]w = -4[/tex]

Answer:

Vertex: (0, 0); Focus: (0, -4); Directrix: y = 4; Focal width: 16 ⇒ answer (a)

Step-by-step explanation:

* Lets revise some facts about the parabola

- Standard form equation for a parabola of vertex at (0 , 0)

- If the equation is in the form  x² =  4py, then  

- The axis of symmetry is the y-axis,  x = 0  

- 4p  equal to the coefficient of y in the given equation to

  solve for  p

- If  p  >  0, the parabola opens up.

- If  p <  0, the parabola opens down.

- Use  p  to find the coordinates of the focus,  (0  ,  p)

- Use  p  to find equation of the directri ,   y= − p

- Use  p  to find the endpoints of the focal diameter,  (±2p  ,  p)

* Now lets solve the problem

- The vertex of the parabola is (0 , 0)

∵ -1/16x² = y ⇒ multiply each side by -16

∴ x² = -16y

∴ 4p = -16 ⇒ ÷ 4 tbe both sides

∴ p = -4

∵ The focus is (0 , p)

∴ The focus is (0 , -4)

∵ The directrix is y = -p

∴ The directrix is y = -(-4) = 4 ⇒ y = 4

∵ The endpoints of the focal diameter,  (±2p  ,  p)

∴ The focal width = 2p - (-2p) = 4p

∴ The focal width = 4 ×  I-4I = 16

* Vertex: (0, 0); Focus: (0, -4); Directrix: y = 4; Focal width: 16

Answer:

A

Step-by-step explanation:

i just took the edg quiz

Answer:

A lot. probably down to a 60

Answer:

Choice A

Step-by-step explanation:

In order to determine the equation of the graph, we can simply graph the four equations using an online graphing utility like desmos graphing tool and then run a comparison to identify the appropriate equation of the given graph.

Below are the graphs of the 4 given equations. The graphs were obtained using the desmos online graphing utility;

From the graphs below, the graph that matches the given graph is the one obtained from;

y = x cosx

This is the equation of the given graph

Answer:

12

Step-by-step explanation:

There are 8 ounces in a cup

8*3=24

24/2(for 2 oz. containers)=12

Answer:

There were 12 full containers packaged for the sale.

Step By Step Explanation:

3 cups of lemonade equals 24 ounces. So take 24 divided by 2 and you get your answer of 12 full 2-ounce containers of lemonade packaged for the sale.

Answer:

i feel like the answer is y=-3x - 1 but at the same time i think its wrong.

Step-by-step explanation:

Answer:y=-3x - 1

Step-by-step explanation:

Answer:

a = 4[tex]\sqrt{3}[/tex]

Step-by-step explanation:

Since the triangle is right use the tangent ratio to find a, that is

tan30° = [tex]\frac{opposite}{adjacent}[/tex] = [tex]\frac{a}{12}[/tex]

Multiply both sides by 12

12 × tan30° = a

12 × [tex]\frac{1}{\sqrt{3} }[/tex] = a

Rationalise the denominator on the left side by multiplying the numerator/ denominator by [tex]\sqrt{3}[/tex]

12 × [tex]\frac{\sqrt{3} }{3}[/tex] = a ( cancel the 12 and 3 )

a = 4[tex]\sqrt{3}[/tex]

Answer:

You should choose the last option because it is the most random at choosing salons to ask and so will give the least biased answer.

Step-by-step explanation:

ask the hair salon and they will tell you what hairstyle is hottest

Answer:

618499.2

answer step by step

5%×13=65

65%×374848=243651.2

243651.2+374848=618499.2

Answer:

16

Step-by-step explanation:

1        1

1        2

1        3

1        4

2        1

2        2

2        3  

2        4

Three and four are done exactly the same way. the total is 16 ways.  

Answer:

UR BAD AT SPELLING KID

Step-by-step explanation:

Answer:

The expected value would be a gain of 1,5

Step-by-step explanation:

For any calculation of expecte value you should multiply the probability of every chance with his value or gain, for example, for this dice

If your roll 1

p(1) = 1/6, and his gain is -1

If your roll 2

p(2) = 1/6, and his gain is -2

If your roll 3

p(3) = 1/6, and his gain is -3

If your roll 4

p(4) = 1/6, and his gain is 4

If your roll 5

p(5) = 1/6, and his gain is 5

If your roll 6

p(6) = 1/6, and his gain is 6

So the expecte value would be

E = p(1)*(-1) + p(2)*(-2)+p(3)*(-3)+p(4)*(4)+p(5)*5+p(6)*6

p(1)=p(2)=p(3)=p(4)=p(5)=p(6)=1/6 because this dice is a cube, with even chances to fall in any face.

E = (1/6)*(-1-2-3+4+5+6)

E=(1/6)*(-6+15)

E=(1/6)*(9)

E=1,5

The expected value would be a gain of 1,5

Answer:

7,400

Step-by-step explanation:

First, we have to see that this is an arithmetic sequence... since to get the next element we add 1 to it.  (a geometric sequence would be a multiplication, not an addition)

So, we have a, the first term (a = 53), and we have the difference between each term (d = 1), and we want to find the SUM of the first 80 terms.

To do this without spending hours writing them down, we can use this formula:

[tex]S = \frac{n}{2} * (2a + (n - 1) * d)[/tex]

If we plug in our values, we have:

[tex]S = \frac{80}{2} * (2 * 53 + (80 - 1) * 1) = 40 * (106 + 79 * 1)[/tex]

S = 40 * (106 + 79) = 40 * 185= 7,400

Answer:

The answer is A. 755 m2; 815 m2

Step-by-step explanation:

The answer is A) 472m^2; 486 m^2.

Let a, b, and c be the sides of the base and h be the height of the prism

a = 2 m

b = 7 m

c = 7.28 m

h = 29 m

The lateral surface area is:

LA = a*h + b*h + c*h = h * (a + b + c)

LA = 29 * (2 + 7 + 7.28) = 29 * 16.28 ≈ 472 m²

The surface area is:

SA = LA + 2 * 1/2 * a * b

SA = 472 + 2 * 7 = 472 + 14 = 486 m²

Answer:

The lateral surface area is 755 sq.m. and total surface area is 785 sq.m.

Step-by-step explanation:

Let a, b, and c be the sides of the base and h be the height of the prism.

a = 5 m

b=6 m

c=11.21 m

h = 34 m

Lateral surface area of triangular prism = [tex](a+b+c)h[/tex]

                                                                 = [tex](5+6+11.21)34[/tex]

                                                                 =755.14 sq.m.

Total surface are of triangular prism = Lateral surface area + area of 2 triangles

                                                         =[tex]755.14+2 (\frac{1}{2} \times b\times h)[/tex]

                                                         =[tex]755.14+2 (\frac{1}{2} \times 5\times 6)[/tex]

                                                         =[tex]785.14[/tex]

Thus the lateral surface area is 755 sq.m. and total surface area is 785 sq.m.

Option B is correct.

the answer for this question is ( d)

The least steep graph is y=1/2x+3.

Hence, the least steep graph is y=1/2x+3.

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[tex]\bf f(x)=-2x^2+11x\implies \left. \cfrac{df}{dx}=-4x+11 \right|_{x=9}\implies -4(9)+11\implies -25[/tex]

Answer:

a) -25

Step-by-step explanation:

First you have to find the derivative of F(x):

[tex]f(x)=2x^{2} +11x\\Derivative=2(2x)+1(11)\\Derivative=4x+11[/tex]

Now you just have to calculate the vale of f(x) when x=9

[tex]-4x+11=\\-4(9)+11=\\-36+11=-25[/tex]

So when x=9, the derivative of [tex]f(x)=2x^{2} +11x[/tex] is equal to -25

Answer:

False. The surface area of the cube will increase to four times its initial value.

Step-by-step explanation:

Consider a cube with edge of lengths [tex]a[/tex]. What will be its surface area?

Each face of a cube is a square. The lengths of sides of the square are also [tex]a[/tex].

The area of each square will be the square of its sides: [tex]a \cdot a = a^{2}[/tex].

It takes six such squares to make a cube. The sum of the area of the sube [tex]6a^{2}[/tex] will also be the surface area of the cube.

In case the length of each side of the cube is doubled to [tex]2a[/tex].

Answer:

SSS

Step-by-step explanation:

Ratio of the corresponding sides of both triangles are equal, so triangles are similar by SSS.

[tex]\frac{6}{9} =\frac{2}{3} \\\frac{14}{21}=\frac{2}{3}\\\frac{16}{24}=\frac{2}{3}[/tex]

Answer: To find the third side of a triangle (there are two answers you could get), you need to use the Pythagorean formula: a^2+b^2=c^2.  First answer, 3^2+5^2=c^2.  Solve for c.  c=5.83.  The second answer, 3^2+b^2=5^2.  Solve for b.  b=4.

\

Answer:

3(x-3)

Step-by-step explanation:

First, we can see that both 3 and 9 are divisible by 3. So we know that 3/3=1 and 9/3=3.

When factoring equations, there have to be parenthesis so it's more organized. So we can put 3 outside of parenthesis:

3(x-3)

The reason we put the 3 outside of parenthesis is because when we multiply 3 by everything in the parenthesis, we will get the equation we originally started with, which is 3x-9.  

So the answer is 3(x-3)

Hope I helped!

~Mschmindy

Answer: First Option

[tex]A = 790.90 cm^2[/tex]

Step-by-step explanation:

The surface area of a circular cone is equal to the area of the cone surface plus the area of the circular base

[tex]A = \pi r ^ 2 + \pi rs[/tex]

Where r is the radius of the base and s is the inclined height of the pyramid.

In this case we know that:

[tex]r = \frac{19}{2}[/tex]

[tex]s = 17[/tex]

Then the surface area of the cone is:

[tex]A = \pi (9.5) ^ 2 + \pi (9.5)(17)[/tex]

[tex]A = 790.90 cm^2[/tex]

[tex]\vec f(x,y,z)=(2yze^{2xyz}+4z^2\cos(xz^2))\,\vec\imath+2xze^{2xyz}\,\vec\jmath+(2xye^{2xyz}+8xz\cos(xz^2))\,\vec k[/tex]

Let

[tex]\vec f=f_1\,\vec\imath+f_2\,\vec\jmath+f_3\,\vec k[/tex]

The curl is

[tex]\nabla\cdot\vec f=(\partial_x\,\vec\imath+\partial_y\,\vec\jmath+\partial_z\,\vec k)\times(f_1\,\vec\imath+f_2\,\vec\jmath+f_3\,\vec k)[/tex]

where [tex]\partial_\xi[/tex] denotes the partial derivative operator with respect to [tex]\xi[/tex]. Recall that

[tex]\vec\imath\times\vec\jmath=\vec k[/tex]

[tex]\vec\jmath\times\vec k=\vec i[/tex]

[tex]\vec k\times\vec\imath=\vec\jmath[/tex]

and that for any two vectors [tex]\vec a[/tex] and [tex]\vec b[/tex], [tex]\vec a\times\vec b=-\vec b\times\vec a[/tex], and [tex]\vec a\times\vec a=\vec0[/tex].

The cross product reduces to

[tex]\nabla\times\vec f=(\partial_yf_3-\partial_zf_2)\,\vec\imath+(\partial_xf_3-\partial_zf_1)\,\vec\jmath+(\partial_xf_2-\partial_yf_1)\,\vec k[/tex]

When you compute the partial derivatives, you'll find that all the components reduce to 0 and

[tex]\nabla\times\vec f=\vec0[/tex]

which means [tex]\vec f[/tex] is indeed conservative and we can find [tex]f[/tex].

Integrate both sides of

[tex]\dfrac{\partial f}{\partial y}=2xze^{2xyz}[/tex]

with respect to [tex]y[/tex] and

[tex]\implies f(x,y,z)=e^{2xyz}+g(x,z)[/tex]

Differentiate both sides with respect to [tex]x[/tex] and

[tex]\dfrac{\partial f}{\partial x}=\dfrac{\partial(e^{2xyz})}{\partial x}+\dfrac{\partial g}{\partial x}[/tex]

[tex]2yze^{2xyz}+4z^2\cos(xz^2)=2yze^{2xyz}+\dfrac{\partial g}{\partial x}[/tex]

[tex]4z^2\cos(xz^2)=\dfrac{\partial g}{\partial x}[/tex]

[tex]\implies g(x,z)=4\sin(xz^2)+h(z)[/tex]

Now

[tex]f(x,y,z)=e^{2xyz}+4\sin(xz^2)+h(z)[/tex]

and differentiating with respect to [tex]z[/tex] gives

[tex]\dfrac{\partial f}{\partial z}=\dfrac{\partial(e^{2xyz}+4\sin(xz^2))}{\partial z}+\dfrac{\mathrm dh}{\mathrm dz}[/tex]

[tex]2xye^{2xyz}+8xz\cos(xz^2)=2xye^{2xyz}+8xz\cos(xz^2)+\dfrac{\mathrm dh}{\mathrm dz}[/tex]

[tex]\dfrac{\mathrm dh}{\mathrm dz}=0[/tex]

[tex]\implies h(z)=C[/tex]

for some constant [tex]C[/tex]. So

[tex]f(x,y,z)=e^{2xyz}+4\sin(xz^2)+C[/tex]

The curl of a vector field can be calculated by finding the determinant of a 3x3 matrix constructed from the unit vectors, partial derivatives, and the components of the vector field. The existence of a function f(x,y,z) such that f⃗ =∇f would imply that the vector field is conservative, meaning it has zero curl.

In mathematics and vector calculus, the curl of a vector field is a vector operator that shows the rotation or the circular motion of the vectors in a vector field. It is denoted by ∇×F. The given vector field f⃗ (x,y,z)=(2yze^(2xyz)+4z²cos(xz²)î⃗ +(2xze^(2xyz)j⃗ +(2xye^(2xyz)+8xzcos(xz²))k). The curl can be obtained by finding the determinant of a matrix.

Consider a 3x3 matrix composed of î, ĵ, and k (in the first row), partial derivates (∂/∂x, ∂/∂y, ∂/∂z) (in the second row), and the vector field components (in the third row). Now, you need to calculate the determinant of this matrix to find the curl of the vector field.

The existence of function f(x,y,z) such that f⃗ =∇f would imply that the vector field is conservative. For a vector field to be conservative, it needs to have zero curl. So, once we have the curl, if it equates to zero, it implies the existence of such a function. Otherwise, no such function exists.

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Answer:   If you want to find out how much 20 percent of 5.4 is, you have to multiply, the equation would be

5.4 x .2 = 1.08, so it will give you 1.08 more

Step-by-step explanation:

Answer:p(side effects| child)=0.42

P(side effects|adults)=0.12

Step-by-step explanation:

Children are twice as likely as adults to experience side effects from the new drug.

The probability that an adult has side effects is 0.12,

while the probability that a child has side effects is 0.42.

This means that children are more likely to experience side effects from the new drug than adults.

We can calculate the probability of side effects for each group by dividing the number of people who experienced side effects by the total number of people in the group:

Probability of side effects in adults = [tex]\frac{6}{50}[/tex] = 0.12

Probability of side effects in children = [tex]\frac{21}{50}[/tex]= 0.42

We can also see this difference in the table provided. Children are more likely to experience side effects from the new drug than adults.

Children are more likely to experience side effects from the new drug than adults

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Answer:

Option B. [tex]865.8\pi\ cm^{2}[/tex]

Step-by-step explanation:

we know that

The surface area of the cone is equal to

[tex]SA=\pi r^{2} +\pi rl[/tex]

we have

[tex]r=13\ cm[/tex]

[tex]h=52\ cm[/tex]

Find the slant height l

Applying Pythagoras \theorem

[tex]l^{2}=r^{2} +h^{2}[/tex]

substitute the values

[tex]l^{2}=13^{2} +52^{2}[/tex]

[tex]l^{2}=2,873[/tex]

[tex]l=53.6\ cm[/tex]

Find the surface area

[tex]SA=\pi(13)^{2} +\pi(13)(53.6)=865.8\pi\ cm^{2}[/tex]

The function with a range of (-π/2, π/2) is the arc sine function, denoted as y = sin-1(x) or y = arcsin(x).

The range of a function is the set of all possible output values it can produce. When referring to a function with a range of (-π/2, π/2), we are usually considering trigonometric functions, particularly the inverse trigonometric functions. The function that has a range between -π/2 and π/2 is the arc sine function, denoted as y = sin-1(x) or y = arcsin(x). This is because the arc sine function is the inverse of the sine function, which oscillates between -1 and 1, and thus its inverse must have a range where the angle could be between -π/2 and π/2 to accommodate this domain.

The sine function itself, which a student might initially think of due to its oscillation, has a domain of all real numbers and a range of [-1,1], so it does not fit the criteria given by the range (-π/2, π/2). It is important to recognize that, while a sine function oscillates between +1 and -1, its inverse function, arc sine, is the one with the specified range as mentioned in the question.

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