BRAINLIEST!!!!!!!!!!!!!!!!!!!!!!

1. A store had 235 MP3 players in the month of January. Every month, 30% of the MP3 players were sold and 50 new MP3 players were stocked in the store.

Which recursive function best represents the number of MP3 players in the store f(n) after n months?

f(n) = 0.7 x f(n − 1) + 50, f(0) = 235, n > 0
f(n) = 237 − 0.7 x f(n − 1) + 50, f(0) = 235, n > 0
f(n) = 0.3 x f(n − 1) + 50, f(0) = 235, n > 0
f(n) = 237 + 0.7 x f(n − 1) + 50, f(0) = 235, n > 0

2. Sophia invested some money in a bank at a fixed rate of interest compounded annually. The equation below shows the value of her investment after x years:

f(x) = 500(1.05)x

What was the average rate of change of the value of Sophia's investment from the second year to the fourth year?

14.13 dollars per year
28.25 dollars per year
50.00 dollars per year
56.50 dollars per year

Answers

Answer 1
Part 1:

Given that a store had 235 MP3 players in the month of January and that every month, 30% of the MP3 players were sold and 50 new MP3 players were stocked in the store.

The number of MP3 players in the store after the previous months sale is given by 0.7f(n - 1) and the number of MP3 players in the store after new MP3 were added is 0.7f(n - 1) + 50.

Therefore, the recursive function that best represents the number of MP3 players in the store f(n) after n months is given by f(n) = 0.7 x f(n − 1) + 50, f(0) = 235, n > 0



Part 2:

The average rate of change of a function from a to b is given by

[tex]average \ rate \ of \ change= \frac{f(b)-f(a)}{b-a} [/tex]

Given that the equation showing the value of her investment after x years is given by

[tex]f(x)=500(1.05)^x [/tex]

Thus, the average rate of change of the value of Sophia's investment from the second year to the fourth year is given by

[tex]Average \ rate \ of \ change= \frac{f(4)-f(2)}{4-2} \\ \\ = \frac{500(1.05)^4-500(1.05)^2}{2} = \frac{607.75-551.25}{2} \\ \\ = \frac{56.5}{2} =28.25[/tex]

Therefore, the average rate of change of the value of Sophia's investment from the second year to the fourth year is 28.25 dollars per year.

Answer 2
1. f(n) = 0.7 x f(n â’ 1) + 50, f(0) = 235, n >= 0 2. 28.25 dollars per year 1. For this problem, let's construct the recursive formula ourselves. We know that f(0) will be 235 since that's the original stock and that n has to be greater than or equal to 0 (n=0 represents the starting stock). So we have f(n) = ?, f(0) = 235, n >= 0 Now each month we sell 30%, so we're left with 70% of the previous month's stock (100% - 30% = 70%). So let's take that into account for our function. f(n) = 0.7 x f(n-1), f(0) = 235, n >= 0 And each month we get another 50 MP3 players. Let's add that into our function. f(n) = 0.7 x f(n-1) + 50, f(0) = 235, n >= 0 And that's our answer. 2. Since we've been given the function f(x) = 500(1.05)^x, let's calculate the amount of money that we have after 2 years and 4 years. f(2) = 500(1.05)^2 = 551.25 f(4) = 500(1.05)^4 = 607.75 Now get the difference in money between those years. 607.75 - 551.25 = 56.50 And since we're talking about a period of 2 years and we want the average rate per year, divide by 2. 56.50 / 2 = 28.25 So the average change from year 2 to year 4 is $28.25 per year.

Related Questions

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That means she need to buy 2 packs of 100.

The volume of wax used in making a cylindrical candle is given by the formula v=nr2h what is the height of the candle in terms of the volume and radius?

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Re-ordering the equation:

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How to calculate variance of negative binomial distribution?

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1/2d + 6

find x and y
x+y=5
x=y+7

Answers

1st equation: x +y =5

 2nd equation: x = y +7

replace x in 1st with 2nd

y +7 +y =5

2y+7 =5

2y =-2

y = -1

now replace y in 2nd with -1

x = -1 +7

x = 6

answer:

x = 6

y = -1

Simplify the product.

8x2(4x2 + 4y6)


a. 32x4 + 32x2y6


b. 12x4 + 12x2y6


c. 32x4 + 32xy8


d.12x4 + 12x2y6

Answers

8x^2 ( 4x^2 + 4y^6 ) 

32 x ^ 4  + 32 x^2 y^6

A is the answer

Answer:

A

Step-by-step explanation:

Prove n choose k equals (n choose k - 1) (n-k+1/k)

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In 2009, the world's largest pumpkin weighed 1,725 kilograms. An average-sized pumpkin weighs 5,000 grams.
The 2009 world-record pumpkin weighs _____ kilograms more than an average-sized pumpkin. (Write your answer as a numeral.)

Answers

1kg=1000g
1kg=................. 1000g
   5 kg=.................5000g

Answer:

The 2009 world-record pumpkin weighs 1720 kilograms more than an average-sized pumpkin.

Step-by-step explanation:

In 2009, the world's largest pumpkin weighed 1,725 kilograms.

An average-sized pumpkin weighs 5,000 grams.

As the answer is needed in kilograms, we will convert 5000 grams in kilograms.

1 gram = 0.001 kilogram

So, 5000 grams = [tex]5000\times0.001[/tex] =5 kilograms.

Difference between weigh = [tex]1725-5=1720[/tex] kilograms

So, the 2009 world-record pumpkin weighs 1720 kilograms more than an average-sized pumpkin.

My number is a multiple of 2 & 7 my number is less than 100 but greater than 50 my number is the product of three prime numbers what number am i?

Answers

12345678910
ihtrguhbvr;wmytpb jq
omuyi bnkq4ht6kljihtlr'iwhvncnh ug5

solve for the variable r in this equation.

[tex] s=2 \pi rh[/tex]

Please and thanks! Also, it would help if you explained how you got your answer! (: ^-^

Answers

divide both sides by [tex]2 \pi h[/tex] which will make the equation
[tex]\frac{s}{2 \pi h} = \frac{2 \pi rh}{2 \pi h} [/tex]
simplifying
[tex]r= \frac{s}{2 \pi h} [/tex]

Solve the inequality -24<×-3-8×

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In this question, you are given an equation with < (less than) sign. You can solve this equation and treat the less than sign same as an equal sign. The only difference is when you mirroring the equation or multiplying both sides with minus, which will change the direction of the sign. The calculation should be:
-24 < x-3 -8 x
-24 +3 < x - 8x 
-21 < -7x
-21/-7 <x
3 <x
x>3

The answer is  D.×>3

The table shows the number of minutes Jalen talks on his mobile phone and the cost of the phone calls. Jalen’s Mobile Phone Cost Number of minutes, x 150 220 250 275 Cost, y $7.50 $11.00 $12.50 $13.75 If the cost varies directly with the number of minutes Jalen talks on the phone, which equation represents the variation?

Answers

From the listed options, it's A) y= 0.05

Like this if it helps-hope it does

Answer:

[tex]y=0.05x[/tex]

Step-by-step explanation:

Given :

x                    Cost, y  

150               $7.50  

220              $11.00

250              $12.50  

275              $13.75

To Find: If the cost varies directly with the number of minutes Jalen talks on the phone, which equation represents the variation?

Solution:

To find equation we will use two point slope form.

[tex]y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)[/tex]

[tex](x_1,y_1)=(150,7.50)[/tex]

[tex](x_2,y_2)=(220,11.00)[/tex]

Substitute the values in the formula.

[tex]y-7.50=\frac{11-7.5}{220-150}(x-150)[/tex]

[tex]y-7.50=0.05(x-150)[/tex]

[tex]y-7.50=0.05x-7.50[/tex]

[tex]y=0.05x[/tex]

Hence the equation which represents the variation is   [tex]y=0.05x[/tex]

What is the equation for a circle centered at the origin

Answers

A circle can be defined as the locus of all points that satisfy the equation
x2 + y2 = r2
where x,y are the coordinates of each point and r is the radius of the circle.

Hope this helps you.

Answer: The equation of the circle is [tex]x^2+y^2=r^2.[/tex]

Step-by-step explanation: We are given to write the equation of a circle centered at the origin.

We know that the standard equation of a circle with center at the point (g, h) and radius 'r' units is given by

[tex](x-g)^2+(y-h)^2=r^2~~~~~~~~~~~~~~~~~~~~(i)[/tex]

The co-ordinates of the origin are (0, 0).

So, if the center of the circle is at the origin, then we have  

(g, h) = (0, 0).

Therefore, from equation (i), we have

[tex](x-0)^2+(y-0)^2=r^2\\\\\Rightarrow x^2+y^2=r^2.[/tex]

Thus, the required equation of the circle is [tex]x^2+y^2=r^2.[/tex]

if a triangle has one right angle then the other two angles are complementary

Answers

Sometimes. All 3 angles have to equal 180 when added together.

If there are 365 days in a non-leap year, what number is christmas day?

Answers

Hello There!

On normal years it is on day 358.
On leap years it is on day 359.
Leap years have one extra day as February 29th.

Hope This Helps You!
Good Luck :) 

- Hannah ❤

ruby is visiting San Francisco. From her hotel she walks 1 block west ans 4 blocks south to a coffee shop. Then she walks 5 blocks east and 6 blocks south to a museum. Where is the museum in relation to her hotel

Answers

The museum is 4 blocks east and 10 blocks south

Answer:

The museum is 4 blocks east and 10 blocks south from her hotel.

Step-by-step explanation:

It is given that ruby is visiting San Francisco. From her hotel she walks:

(a) 1 block west and 4 blocks south to a coffee shop.

(b) Then she walks 5 blocks east and 6 blocks south to a museum.

First she moves 1 block west and 4 blocks south and reached at point B. After that she walks 5 blocks east and 6 blocks south and reached at point D.

From the below figure it is noticed that point D is 4 blocks east and 10 blocks south from the origin because

[tex]South=4+6=10[/tex]

[tex]East=5-1=4[/tex]

Therefore the museum is 4 blocks east and 10 blocks south from her hotel.

Graph the equation
Do number 25,26,27

Answers

25. The first one you should draw a vertical line going through 2, the whole way

26. Draw a horizontal line go through negative 5

27.2y = -6
y = -3 
Draw a horizontal line go through -3 

I can draw the graphs if you still dont understand
25. x = 2
26. y = -5
27. y = -3

Find measure of angle d A. 122 degrees B. 61 degrees C. 238 degrees D. Not enough information

Answers

It is B. 61 degrees, you can estimate.

Answer:

B. [tex]61^{\circ}[/tex]

Step-by-step explanation:

We have been given an image of a quadrilateral. We are asked to find the measure of angle D.

We can see that angle A and angle D are equal, so we can represent measure of both angles as [tex]2D[/tex].

We know that all the interior angles of a quadrilateral are equal to 360 degrees, so we can set an equation as:

[tex]2D+98^{\circ}+140^{\circ}=360^{\circ}[/tex]

[tex]2D+238^{\circ}=360^{\circ}[/tex]

[tex]2D+238^{\circ}-238^{\circ}=360^{\circ}-238^{\circ}[/tex]

[tex]2D=122^{\circ}[/tex]

[tex]\frac{2D}{2}=\frac{122^{\circ}}{2}[/tex]

[tex]D=61^{\circ}[/tex]

Therefore, the measure of angle D is 61 degrees and option B is the correct choice.

I need help!! can someone please help me

Answers

Answer:

D

Step-by-step explanation:

The missing step is to perform the inverse of a square root by squaring both sides of the equation. This means to multiply 18*18=324 and the square root expression leaving just the inside untouched. The correct step is D.

Answer:

answer is d

Step-by-step explanation:

Stacey is selling tickets to the school play. the tickets are $6 for adults and $3 for children. she sells twice as many adult tickets as children's tickets and brings in a total of $360. how many of each kind of ticket did she sell?

Answers

suppose she sells x children's tickets, the number of adult tickets is 2x
cost of adult tickets: 6*2x =12x
cost of children's tickets: 3*x
total is 360: 12x+3x=360
15x=360
x=24
24 children's tickets and 48 adult tickets

If the greatest integer function is called the floor function because it rounds any number down to the nearest integer, what would you presume about the ceiling function?

Answers

Ceiling Function is the least integer that is greater than or equal to x.
Answer with explanation:The greatest integer function which is also known as a floor function rounds any number down to the nearest integer.

for example--

         If -2  ≤x <-1 then value of function is -2

        If   -1 ≤x < 0 then value of function is -1

        If   0 ≤x < 1 then value of function is 0

        If   1 ≤x < 2 then value of function is 1

and so on.

Similarly the least integer function which is also known as a ceiling function rounds any number up to the nearest integer.

for example--

         If -2  < x ≤ -1 then value of function is -1

        If   -1 < x ≤ 0 then value of function is 0

        If   0 < x ≤ 1 then value of function is 1

        If   1 < x ≤ 2 then value of function is 2

and so on.


What is 2^3 * 2^2
You don't have to show work

Answers

2 ^3 = 2 x 2 x 2
2 ^2 = 2 x 2

2 x 2 x 2 x 2 x 2 = 2^5

2^5 = 32

hope this helps
assuming that the ^3 and ^2 are exponents,

Remember G.E.M.S.? (grouping > EXPONENT! > Multiplication/division > Subtraction/addition) 2*2*2=8*(2*2) = 8*4=  32

Triangle 1 is transformed as shown in the diagram, resulting in triangle 3. Describe the transformations.
A) dilation, then reflection
B) rotation, then translation
C) reflection, then translation
D) translation, then reflection

Answers

Triangle 1 - 2 shows a translation. A translation is when the triangle doesn't change shape, rotation, or size. It just slides. The 2- 3 shows a mirror image, which would be a reflection. Therefore, your answer is D.

Answer:

D) translation, then reflection

Step-by-step explanation:

First the triangle 1 is translated in the right side to make triangle 2. Then the 2 triangle is reflected over to get triangle 3.

So, the correct answer is - translation, then reflection

In reflection transformation, the figure is reflected or flipped on a line called the axis of reflection or line of reflection. And translation means moving or shifting of a figure.

Find the value of m angle 3-m<1

Answers

Answer:

The value of [tex]m\angle 3-m\angle 1[/tex] = [tex]50^{\circ}[/tex]

Step-by-step explanation:

Vertical Angle theorem: It is about the angles that are opposite to each other.

Also, vertical angle are congruent that means vertical angles are equal.

In the given figure; [tex]m\angle 3[/tex] and [tex]70^{\circ}[/tex] are vertical angle

then, by vertical angle theorem,  [tex]m\angle3 =70^{\circ}[/tex].

Supplementary angle: the sum of the angles whose measure on the straight line is 180 degree.

From the figure, [tex]70^{\circ}[/tex] , [tex]\angle 1[/tex] and [tex]m\angle 2 =90^{\circ}[/tex] forms a straight line.

then, by the definition of Supplementary angle;

[tex]70^{\circ}+m\angle 1 +m\angle 2=180^{\circ}[/tex]

Substituting the value of  [tex]m\angle 2 =90^{\circ}[/tex] in above equation:

[tex]70^{\circ}+m\angle 1 + 90^{\circ} =180^{\circ}[/tex] or

[tex]160^{\circ}+m\angle 1=180^{\circ}[/tex]

Simplify:

[tex]m\angle 1=180^{\circ}-160^{\circ} =20^{\circ}[/tex]

therefore,  [tex]m\angle 1= 20^{\circ}[/tex] and [tex]m\angle 3=70^{\circ}[/tex],

the value of [tex]m\angle3-m\angle1= 70^{\circ}-20^{\circ} =50^{\circ}[/tex].






How many watches must he repair to have the lowest cost?

Answers

Hahah shut up hsiaiwjnsjrbwk

The distance between New York City, New York and Los Angeles, California is approximately 4485 kilometers. What is the distance between these two major cities in miles? Use the conversion equivalency of 1 mile = 1.609 kilometers and round to the nearest mile.

Answers

this is your best hope! 

2786.85 Miles

Answer:

The answer is 2788 miles.

Step-by-step explanation:

The distance between New York City, New York and Los Angeles, California is approximately 4485 kilometers.

The given conversion rate is:

1 mile = 1.609 kilometers

or 1.609 km = 1 mile.

So, 1 km = [tex]\frac{1}{1.609}[/tex] miles

And 4485 km = [tex]\frac{1}{1.609}*4485[/tex] miles

= 2787.45 miles.

In nearest miles we can round this to 2788 miles.

The area of greenland is 840,000 square miles. what is this number in scientific notation?

Answers

the answer is 8.4x10^5

Final answer:

The area of Greenland in scientific notation is 8.4 x 10⁵ square miles.

Explanation:

The area of Greenland is 840,000 square miles. Writing this number in scientific notation involves expressing it as the product of a number between 1 and 10 and a power of 10.

To convert 840,000 to scientific notation, first identify the coefficient that is between 1 and 10. In this case, it is 8.4. Next, count how many places you move the decimal point to get from 840,000 to 8.4. You move the decimal five places to the left, so the exponent for 10 will be 5. Thus, the scientific notation for 840,000 is 8.4 × 10⁵.

There is a step missing from the solution below. Which equation is the missing step?
P=17-√0.025x+7
25=17-√0.025x+7
8=-√0.025x+7
?
57=0.025x
2280= x

A. 64=0.025x+49
B. 8=0.025x+7
C. -8= √0.025x+7
D. 64=0.025x+7

Answers

Answer:

option: D is the correct answer.

( D. 64=0.025 x+7 )

Step-by-step explanation:

We are given step as:

[tex]P=17-\sqrt{0.025x+7}\\\\25=17-\sqrt{0.025x+7}\\\\8=-\sqrt{0.025x+7}------(1)[/tex]

?

57=0.025x

-----------(2)

2280= x.

We are asked to find the missing step.

Clearly after equation (1)

They have squared the equation both side to obtain:

[tex]64=0.025x+7[/tex]

and then they took the constant term to the left hand side to obtain equation (2).

[tex]64-7=0.025x\\\\57=0.025x[/tex]

Hence, the correct option is:

Option: D

D. 64=0.025 x+7

Answer: 64=0.025x+7

Step-by-step explanation:

a p e x

A person has two times as many nickels as quarters. if the total face value of these coins is $4.55, how many of each type of coin does this person have?

Answers

Let
He has = x quarters
He has = 2x nickels 

Total Amount = $3.50 or 3.50*100 = 350 cents 

x*25+2x*5=350
25x+10x=350
35x=350

35x/35=350/35
x=10 

He has = x = 10 quarters 
He has = 2x = 2*10 = 20 nickels 

Check
====== 
10*25 + 5*20 = 350
250+100=350
350=350

Which can be a next step in the construction of an angle with a side on line l that is congruent to ∠ABC?

Answers

To construct an angle with a side on line l that is congruent to ∠ABC, follow these steps: Draw line l, measure ∠ABC, draw a ray from line l with the same angle, label the intersection point as B, and segment AB is congruent to side AC.

To construct an angle with a side on line l that is congruent to ∠ABC, you can follow these steps:

Draw line l.

Use a protractor to measure ∠ABC.

Draw a ray from line l, starting at point A and making the same angle as ∠ABC.

Label the point where the ray intersects line l as B.

Now, segment AB is congruent to side AC of ∠ABC.

Write the ratio as a ratio of whole numbers using fractional notation. Write the fraction in simplest form.

8 to 30

A - 4/15
B - 104/9
C - 104/13
D - 72/104

Pleaaase explain how you do it!

Answers

Reducing a ratio is the same as reducing a fraction. As long as you divide the top and the bottom by the same number, you are reducing it. In this case, we can divide the top and the bottom by 2, giving us 4 to 15. Your answer would be A- 4/15. If you have any more questions let me know in the comments!
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