Use the information provided to write the equation of the circle. Center: (-8,11) Radius:2

Answers

Answer 1

Use the information provided to write the equation of the circle Center (-8, 11) Radius is 2  is equal to (x + 8)² + (y - 11)² = 4.

What is equation of the circle?

To write the equation of a circle, we need to know its center and radius. If we have the center at point (a, b) and the radius is r, the equation of the circle is:

                     (x - a)² + (y - b)² = r²

If you have the specific values of a, b, and r, you can plug them into this equation to get the equation of the circle.

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

(x - h)² + (y - k)²= r²

Using the given information, we can substitute the values into the equation:

(x - (-8))² + (y - 11)² = 2²

Simplifying, we get:

(x + 8)² + (y - 11)² = 4

Therefore, the equation of the circle with center (-8, 11) and radius 2 is:

(x + 8)² + (y - 11)² = 4

This equation represents all the points that are 2 units away from the center (-8, 11).

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Related Questions


Is one bank ALWAYS better? What factors might affect which bank has the better fee
structure?

Answers

No one bank is not always better. Factors such as the fees and the charges in one bank may differentiate it from another bank.

What may cause a bank to be better than another bank?

No, one bank is not always better than another. The best bank for an individual depends on a variety of factors, including their financial needs and preferences, location, and the fees and charges associated with different banks.

For example, one bank may have lower fees for checking accounts but higher fees for ATM withdrawals or international transactions, while another bank may have higher fees for checking accounts but lower fees for other services.

Other factors that might affect which bank has the better fee structure include the type of account, the minimum balance required to avoid fees, and the level of customer service provided by the bank. Ultimately, the best bank is the one that meets an individual's financial needs at the lowest cost.

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More than 50 years after it jumped the species barrier and became one of the most devastating viruses to affect​ mankind, HIV remains a stubborn adversary. Treatment has improved dramatically over the past 20 years and​ now, a cure could be in sight.
​Source: The Guardian​, November​ 30, 2018
Make a graph of the production possibilities frontier with​ HIV/AIDS cases treated on the x​-axis and other goods and services on the y​-axis before and after the advance in technology.
Question content area bottom left
Part 1
The opportunity cost of treating​ HIV/AIDS cases increases as more​ HIV/AIDS cases are treated.
Draw a curve that shows the production possibilities for the world economy that produces​ HIV/AIDS treatments and other goods and services. Label the curve PPF0.
Then draw the PPF that shows the effect of an advance in technology on​ HIV/AIDS treatments. Label the curve PPF1.

Answers

On solving the provided question, we can say that from the graphs The curve preceding technolοgical advancement is called PPF0. PPF1 is the curve following technological advancement.

What is graphs?

Mathematicians use graphs to logically convey facts or values using visual representations οr charts. A graph point will typically reflect a relationship between two or more things. Nodes, or vertices, and edges make form a graph, a non-linear data structure. Glue tοgether the nodes, οften referred to as vertices. This graph has vertices V=1, 2, 3, 5, and edges E=1, 2, 1, 3, 2, 4, and (2.5), (3.5). (4.5). Statistical charts (bar charts, pie charts, line charts, etc.) graphical representations of expοnential growth. a logarithmic graph in the shape οf a triangle

The curve preceding technolοgical advancement is called PPF0. PPF1 is the curve following technοlogical advancement.

Priοr to technological advancement, the opportunity cost of treating HIV/AIDS rises as the wοrld deviates from its PPF. The pοtential cost of treating more HIV/AIDS cases falls as a result of technοlogical advancements since less other commοdities and services must be sacrificed in οrder to treat more HIV/AIDS patients. Alternatively, the world might treat mοre HIV/AIDS patients right now by forgoing the same number of other commοdities and services.

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In Iceland, the temperature drops when the sun goes down. The temperature at 5:00 is 5°C. By 9:00, the temperature had dropped 24°. If the temperature dropped at a constant rate, how much did it drop per hour?

Answers

If the temperature dropped at a constant rate, it would have dropped 4°C per hour. This can be calculated by taking the difference in temperature (24°C) and dividing it by the number of hours that passed (4 hours).


Two hundred college students were recently asked if they participated in music or sports. 127 students said they were
involved in music. 78 students said they participated in both activities, while 20 students did not participate in either.

How many students participated in only music?

How many students participated in only sports?

How many students were involved in music or sports?

Answers

Using Venn diagram, 49 students participated in only music, 29 students participated in only sports, and 156 students were involved in either music or sports.

What is the number of students that participated in only music

Let's use a Venn diagram to represent the information given:

We know that there are 200 students in total, and we can use the information given to fill in the numbers in the Venn diagram.

a.

127 students were involved in music, including 78 who were also involved in sports, so 127 - 78 = 49 students participated in only music.

b.

78 students participated in both music and sports, so 78 - 49 = 29 students participated in only sports.

20 students did not participate in either activity.

c.

The total number of students involved in music or sports is the sum of the number of students in each circle: 49 + 29 + 78 = 156.

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Find the length of WB

Answers

Answer:

WB = 16 in

---------------------------

According to picture we observe:

W is midpoint of AT and B is the midpoint of TE.

The segment connecting the midpoints is the midsegment.

As per property of the midsegment, it is parallel to opposite side and is half of its measure.

It tells us that WB is parallel to AE and:

WB = AE/2 WB = 32/2WB = 16 in

The triangle below is equilateral. Find the length of side � x in simplest radical form with a rational denominator. x 6

Answers

The length of the side is 12 units in simplest radical form with a rational denominator.

What is an equilateral triangle?

A triangle is said to be equilateral if all of its sides and angles are equal. An equilateral triangle is also known as an equiangular triangle since each of its angles has a value of 60 degrees.

Given:

The triangle given in the image is an equilateral triangle.

That means the angle measure of the triangle is 60° each.

And all the sides are equal.

To find the value of x:

Sin(60/2)° = opposite/ hypotenuse.

Sin30° = x/6

x = 6/Sin30°

[tex]x = \frac{6}{1/2}[/tex]

x = 6(2)

x = 12

Therefore, the value of x is 12 units.

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The complete question:

The triangle below is equilateral. Find the length of the side in simplest radical form with a rational denominator.

The image is given below.

LMNO is a parallelogram. If NM = x + 37 and OL = 5x + 9 find the value of x.

Answers

The value for the variable x in the parallelogram is equal to 7.

How to evaluate for the variable x in the parallelogram

The parallelogram LMNO have two pairs of parallel sides hence LO = MN and LM = ON.

We shall evaluate for variable x as follows:

5x + 9 = x + 37

5x - x = 37 - 9 {collect like terms}

4x = 28

x = 28/4 {divide through by 4}

x = 7

Therefore, the value for the variable x in the parallelogram is equal to 7.

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The value of the variable x is 7

How to determine the value

It is important to note that the opposite sides of a parallelogram are congruent or equal in length.

Then, for the parallelogram LMNO

NM is parallel to OL

Now, substitute the values, we get;

NM = OL

x + 37 = 5x + 9

collect like terms

x - 5x = 9 - 37

subtract the like terms

-4x = -28

Make 'x' the subject

x = 7

Hence, the value is 7

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Xx
Which equation models the rational function shown in
the graph?
2(x+2)
X-2
O f(x) =
O f(x) = x-2
x+2
2(x-2)
x+2
Of(x)=.
O f(x) = x+2
X-2

Answers

At x=2, the function in the graph is approaches to infinity. This is satisfied by equation 1 that models the rational function, hence option 1 is the correct answer.

What is equation?

A mathematical definition of an equation is a claim that two expressions are equal when they are joined by the equals sign ("="). For illustration, 2x - 5 = 13.

Two expressions are combined in an equation using an equal symbol ("="). The "left-hand side" and "right-hand side" of the equation are the two expressions on either side of the equals sign. Typically, we consider an equation's right side to be zero.

From given graph we can see that

At x=2, the function in the graph is approaches to infinity.

It means function is not defined at x=2

We know that a rational function is undefined when denominator is equal to zero.

For equation 1:

f(x)= 2(x+2)/(x-2)

Equating the denominator:

x-2=0

x=2

It means function is not defined at x=2

The y-intercept is: y= -2

The function is passing through the point (1,-6).

When we substitute x=1

Hence, option 1 is true.

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If a rock is thrown upward on an exoplanet of a nearby star with initial velocity…..

Answers

the displacement is 23.14m and the velocity is 21.28m/s

What is quadratic equation?

it's a second-degree quadratic equation which is an algebraic equation in x. Ax2 + bx + c = 0, where a and b are the coefficients, x is the variable, and c is the constant term, is the quadratic equation in its standard form. A non-zero term (a 0) for the coefficient of x2 is a prerequisite for an equation to be a quadratic equation. The x2 term is written first, then the x term, and finally the constant term is written when constructing a quadratic equation in standard form. In most cases, the numerical values of letters a, b, and c are expressed as integral values rather than fractions or decimals.

The given equation y  = 25t - 1.86t²

at t =  1

So the displacement y = 25-1.86 = 23.14

to find velocity dy/dt = 25- 2(1.86)t

v = 25 - 3.72 = 21.28m/s

Hence the displacement is 23.14m and velocity is 21.28m/s

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Graph ​h(x)=−x2+3​.

Use the parabola tool then choose the vertex followed by one point on the parabola.

Answers

Answer: I do not have the capability to create a graph. However, I can tell you how to graph the parabola h(x) = -x^2 + 3.

A parabola is defined by its equation in the form y = ax^2 + bx + c, where a, b, and c are constants. In this case, a = -1, b = 0, and c = 3.

The vertex of the parabola is the highest or lowest point on the graph and is given by the coordinates (-b/2a, c - b^2/4a). For this parabola, the vertex is (0, 3), since b = 0 and a = -1.

To find another point on the parabola, you can plug in any x-value and use the equation of the parabola to find the corresponding y-value. For example, if you plug in x = -2, you get:

h(-2) = -(-2)^2 + 3

h(-2) = 4 + 3

h(-2) = 7

So the point (-2, 7) is also on the parabola.

With the vertex and one other point on the parabola, you can now graph the parabola.

Step-by-step explanation:

Will is moving from Boston to Philadelphia which is 300 miles away. He is traveling at an

Answers

Will is traveling at an average speed of 60 miles per hour. At that speed, it will take him 5 hours to travel from Boston to Philadelphia

NEED HELP ASAP!!!

Due today

Answers

Answer:

  20 cubic yards

Step-by-step explanation:

You want to know the volume in cubic yards of a layer of topsoil that is 6 inches deep over an area 31 feet by 34 feet.

Units

You know that ...

36 inches = 1 yard3 feet = 1 yard

Then the dimensions of the volume being applied are ...

  6 inches = 6/36 yards

  31 feet = 31/3 yards

  34 feet = 34/3 yards

Volume

The volume is the product of the dimensions of the space:

  V = LWH

  V = (31/3 yd)(34/3 yd)(6/36 yd) ≈ 19.519 yd³

About 20 cubic yards are needed to fill the garden.

A true-false quiz contains six questions. In how many ways can a student answer the questions if the student answers two of the questions with "false" and the other four with "true"?

Answers

Answer: In each question you have two options, T and F. Then in 6 questions you have 2 options for the first, two for the second, two for the third... At the end you get 2·2·2·2·2·2 = 26 options and 26 = 64.

Step-by-step explanation:

Which of the following equations represents a linear function? Please show the steps of the answer! Thank you

Answers

Answer:

2nd choice  y = 1/2x - 5

Step-by-step explanation:

y = 1/2x - 5  is the only function listed that if you graph it, it makes a straight line.   A linear function forms a straight line when it is plotted on a graph.

The first and last choices are number values of x.

The 3rd choice, if you graph it, makes a parabola.

Answer:

Second option:

[tex]y = \dfrac{1}{2}x -5[/tex]

Step-by-step explanation:

A linear function should have y as a function of x (or x as a function of y) and the degree of the function (the highest power has to be 1)

Both x and y must be present to make it a linear function

General slope intercept form is y = mx + b where m = slope, b = y-intercept

With these restrictions the second option is the correct one
[tex]y = \dfrac{1}{2}x -5[/tex]

This line is in slope intercept form y = mx + b where m = slope(in this case 1/2) and y-intercept b(in this cae -5)

Option 1:  x = 3 is a straight vertical line parallel to the y-axis. Such a line has a slope of ∞

Option 3 is a function with degree 2 and is a quadratic function

Option 4 : 3x - 6 = 4==> 3x = 6 + 4 = 10 or x = 10/3, again another vertical line with slope = ∞

The temperature in a certain location was recorded each day for two months. The mean temperature was 28.8°F with a standard deviation 7.4°F. What can you determine about these data by using Chebyshev's Inequality with =K3?

Answers

Answer:

Chebyshev's inequality states that for any given dataset, at least 1 - 1/k^2 of the data will lie within k standard deviations from the mean.

When k = 3, at least 1 - 1/3^2 = 1 - 1/9 = 8/9 of the data will lie within 3 standard deviations from the mean.

So, for the temperature data, we can determine that at least 8/9 of the data will lie between 28.8 - 3 × 7.4 = 7°F and 28.8 + 3 × 7.4 = 50.6°F.

In other words, we can say that at least 8/9 of the temperatures recorded during the two months were between 7°F and 50.6°F.

Answer the following questions

Answers

The system of equations that can be used to find the length of each workout and the duration of each workout are as follows;

(a) 5·x + 3·y = 10

2·x + 6·y = 10

(b) Length of each Plan A workout: 1.25 hours

Length of each Plan B workout: 1.25 hours

What are linear system of equations?

A linear system of equation consists of two or more linear equations that share common variables.

(a) The number of Plan A workouts Mary trained on Wednesday = 5

Number of Plan B workouts she trained on Wednesday = 3

The total time (in hours) Mary trained both workouts on Wednesday = 10

Where x represents the length (in hours) of each of the Plan A workout, and B represents the time in hours of each of the Plan B workout, we get;

5·x + 3·y = 10

Similarly, the number of Plan A workouts trained on Thursday = 2

Number of Plan B workout trained on Thursday = 6

The duration of training of all workouts on Thursday = 10 hours

Therefore, we get;

2·x + 6·y = 10

The system of equations that could be used to find the length (in hours) of each type of workout can be presented as follows;

5·x + 3·y = 102·x + 6·y = 10

(b) The first equation from the system of equations indicates that we get;

5·x + 3·y = 10

3·y = 10 - 5·x

y = (10 - 5·x)/3

Plugging the value of y above into the second equation from the system of equations, we get;

2·x + 6·y = 10

2·x + 6 × ((10 - 5·x)/3) = 10

2·x + 2·(10 - 5·x) = 10

2·x + 20 - 10·x = 10

20 - 8·x = 10

8·x = 20 - 10 = 10

x = 10/8 = 1.25

The length of each Plan A workout, x = 1.25 hours

y = (10 - 5·x)/3,

x = 1.25, therefore;

y = (10 - 5 × 1.25)/3 = 1.25

y = 1.25

The length of each Plan B workout = 1.25 hours

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The shape of the distribution of the number of clase friends for the males is best characterized as

Answers

The shape of the distribution of the number of clase friends for the males is best characterized as Skewed to the higher values (right or positively skewed).

What are shapes called in math?

Construction of closed geometric shapes involves the usage of points, line segments, circles, and curves. These shapes are all around us. Circles, rectangles, triangles, and other shapes are examples of geometric shapes. Triangle-shaped slices make up the shape of a pizza

What are the basic shapes?

The basic shapes include the square, circle, triangle, and other simple shapes that cannot be further subdivided into the simpler shapes by general standards.

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You can work a total of no more than 32 hours each week at your two jobs. Tutoring pays $7 per hour and babysitting pays $8 per hour. You need to earn at least $256 each week to pay your bills.

Let X = the number of hours tutoring. Let Y = the number of hours babysitting

Answers

Answer: The correct system of linear inequalities that represents this situation is:

X + Y ≤ 32 (to represent the maximum number of hours you can work)

7X + 8Y ≥ 256 (to represent the minimum amount of money you need to earn)

X ≥ 0, Y ≥ 0 (to represent that you can only work a non-negative number of hours at each job)

Where X represents the number of hours you spend tutoring and Y represents the number of hours you spend babysitting. The first inequality represents the maximum number of hours you can work, and the second inequality represents the minimum amount of money you need to earn. The last two inequalities represent that you can only work a non-negative number of hours at each job.

Step-by-step explanation:

10. Susan has $800 in her bank account. Every week, she withdraws $100 for spending money.
A) What is the rate of change (or slope) in this situation?
B)
How much will she have left in her account after five weeks?

Answers

A) The rate of change in this situation is -$100 per week.

B) She will have $300 left in her account after five weeks.

Other than a no solution​ set, use interval notation to express the solution set and then graph the solution set on a number line.
2x+4<10

Answers

The solution set of the inequality is [3, ∝)

How to determine the solution set

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

2x + 4 < 10

Subtract 4 from both sides of the inequality

So, we have the following representation

2x + 4 - 4 < 10 - 4

Evaluate the like terms

2x < 6

Divide both sides by 2

x < 3

When represented as an interval notation, we have

[3, ∝)

See attachment for the inequality of the solution set

Hence, the solution is [3, ∝)

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Write System of Equations from Context
Kennedy has $0.81 worth of pennies and nickels. She has 9 more nickels than
pennies. Write a system of equations that could be used to determine the number of
pennies and the number of nickels that Kennedy has. Define the variables that you
use to write the system.
Let __=_________
Let__=___________

System of Equations:
_________________

_________________

Answers

Let p = the number of pennies Kennedy has
Let n = the number of nickels Kennedy has

Based on the information given, we can write the following two equations:

The total value of pennies is 0.01p
The total value of nickels is 0.05n
Kennedy has 9 more nickels than pennies, so we can write: n = p + 9
So, the system of equations is:

0.01p + 0.05n = 0.81
n = p + 9

This system of equations can be used to determine the number of pennies and nickels Kennedy has.

Money A savings account increases from $200 to $206. What is the percent increase of the savings account?

Answers

Answer:

3% increase

Step-by-step explanation:

Suppose you pay $1.00 to roll a fair die with the understanding that you will get back $
3.00 for rolling a 1 or a 3, nothing otherwise. What is your expected net winnings?
for
lingun?

Answers

Answer:

21.7% to win $3, thats ~1/5

Step-by-step explanation:

100/6 = 10.(6) % to roll for each number (let it be just ~10.7)

for rolling a 3 or a 1 u will get $3

10.7 + 10.7 = 21.7% to win $3, thats 1/5

HELPPPP PLS I NEED HELP

Answers

According to the given information the lateral surface area of given cylinder is 725.34 in².

What can you say about a cylinder?

In mathematics, a cylindrical is indeed a three-dimensional solid that retains two parallel bases spaced apart by a curving surface. These bases frequently have a circular shape (like a circle), and also an axis links their respective centers.

What three qualities does a cylinder have?

A cylinder is a three-dimensional form having two parallel, round sides on either end, one side that curves, no vertices or edges.

As we know that the lateral surface area of cylinder (A) = 2πrh

Given

D = [tex]16\frac{1}{2}[/tex]in

h = 14in

r = D/2

 = 33/4 in

A = (2 × 3.14 × 33 × 14) / 4

   = 2901.36 /4

   = 725.34 in²

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well asap due today pls

Answers

Answer:

96 in²

Step-by-step explanation:

Length of Semiperimeter

[tex]\displaystyle s=\frac{1}{2}(a+b+c)=\frac{1}{2}(12+16+20)=\frac{1}{2}(48)=24[/tex]

Area of Triangle w/Heron's Formula

[tex]A=\sqrt{s(s-a)(s-b)(s-c)}=\sqrt{24(24-12)(24-16)(24-20)}=\sqrt{24(12)(8)(4)}=\sqrt{9216}=96[/tex]

Hence, the area of the triangle is 96 in².

Identify true statements about set membership and subsets

Answers

The statement that are true are :

a. Z is an element {y,z}

b. {6,7,8 } is a subset of {1,2,3,4......}

c. 3 is an element of {2,3}

d. r is not an element of {s,t,u}

What is set?

A set is the mathematical model for a collection of different things; a set contains elements or members, which can be mathematical objects of any kind: numbers, symbols, points in space, lines, other geometrical shapes, variables, or even other sets.

The objects in a set are called the elements (or members ) of the set; the elements are said to belong to the set (or to be in the set), and the set is said to contain the elements.

The following statements are true about the set

a. Z is an element {y,z}

b. {6,7,8 } is a subset of {1,2,3,4......}

c. 3 is an element of {2,3}

d. r is not an element of {s,t,u}

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Multiply the following radicals and simplify your answer.

2√6⋅−3√12

Answers

If we simplify them we will get
-2√6×3×2√3
For further more simplification:

-2√6×3×2√3= -12√18
Simplifying the radical expression
We will have -36√2
So the answer is -36√2 or -50.911

Write an equation for a rational function with the given characteristics.
Vertical asymptotes at x = -2 and x = 3,2-intercepts at (-4, 0) and (-1,0), y-intercept at (0,4).

F(x)=

Answers

The equation of the rational function with the given features is given as follows:

F(x) = [4(x² + 5x + 4)]/(x² - x - 6).

How to define the rational function?

A rational function is a fraction, in which both the numerator and the denominator contain instances of the variable x.

Considering the x-intercepts, the numerator of the function is defined as follows:

y = a(x + 4)(x + 1)

y = a(x² + 5x + 4).

Considering the y-intercept at (0,4), the leading coefficient a is given as follows:

a = 4.

The vertical asymptotes determine the zeros of the denominator, which is given as follows:

(x + 2)(x - 3) = x² - x - 6.

Hence the function is defined as follows:

F(x) = [4(x² + 5x + 4)]/(x² - x - 6).

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NEED PLS THANK YOU DUE TODAY

Answers

Now , to find the area

Total area of figure = Area of first Triangle + Area of second triangle

The area of the triangle = ( 1/2 ) x Length x Base

Total area of figure = ( 1/2 ) x ( 36 x 15 ) + ( 1/2 ) x ( 15 x 8 )

= ( 1/2 ) x 540 + ( 1/2 ) x 120

= 270 + 60

= 330 inches²

Therefore , the value is 330 inches²

Hence , The area of the figure is 330 inches²

Solve for x

2,4, and 6 i need help with

Answers

Answer: x=56

Step-by-step explanation: Question 2 shows a right angle that is equal to 90 degrees. Since you are already given 34, you just need to subtract 90-34.

Question 4 shows an 180 degree angle and so you need to do the same thing; 180-124

Other Questions
In the novel, Where theCrawdads Sing, how doKya's origins shape herinto the person she isthroughout the text? The graph shows the total points earned for several pairs of shoes. The initial number of points earned when signing up is ________. The number of points earned per pair of shoes purchased is _________. how many homunculi are present in the primary somatosensory cortex? winning the game tic-tac-toe involves what kind of problem-solving?Heuristics Intuition Insight Algorithm What nonverbal communication is used to __________ emphasize parts of the verbal message? Individually, you have to talk about activities that started in the past and that havent finished yet. You could present your information in a timeline. For this evaluation you must use The Present Perfect and The Present Perfect Continuous as well as The Simple Past. pleasee The angle y and 49 are complementary,find the value y 6. Pilihan ganda30 detik1 ptQ. ______ involves paying attention to the speaker completely, concentrating on the verbal message, observing for nonverbal cues, and offering a response.Pilihan jawabanActive listeningPassive listeningClose-ended questionsOpen-ended questions The stock price of Company A decreased by $1.27 every day for 4days. The fifth day, the stock price increased by $3.47. What wasthe total change in the stock's price over 5 days? Does anyone know the answers for daffynition decoder solving proportions What did the Minnesota study of twins emphasize? Eleanor and Park Questions: Chapter 16-20What do Eleanor and Park share with one another and not share with one another in their very revealing phone call? What does Park say at the end of the phone call that he frets over the next day? find the equation of a line passing through two points (1,-1, 2) and (0,2-3). espresso express operates a number of espresso coffee stands in busy suburban malls. the fixed weekly expense of a coffee stand is $1,200 and the variable cost per cup of coffee served is $0.22. required: 1. fill in the following table with your estimates of the company's total cost and average cost per cup of coffee at the indicated levels of activity. 2. does the average cost per cup of coffee served increase, decrease, or remain the same as the number of cups of coffee served in a week increases? What type of cell function does microvilli indicate? what ship was george dewey aboard when he led the americans to victory over the spanish at the battle of manila bay? 3David and Alec are comparing the international calling plans on their cell phones. On his plan,David pays $4 just to place a call and $1 for each minute. When Alec makes an internationalcall, he pays $1 to place the call and $2 for each minute. A call of a certain duration wouldcost exactly the same under both plans. What is the duration?Write a system of equations, graph them, and type the solution. Which two statements describe how igneous rock is formed summarize the difference you observed between the model of the white eyed fly's dna sequence and the model of the red eyed fly's dna sequence. olds and milner located reward centers in the brain structure known as the