HELP WILL MEDAL
Question 8 (Multiple Choice Worth 1 points)

(04.03)

A dance competition on television had five elimination rounds. After each elimination, only one-fourth of the contestants were sent to the next round. The table below shows the number of contestants in each round of the competition:

x 1 2 3 4 5
f(x) 512 128 32 8 2

Compute the average rate of change of f(x) from x = 2 to x = 4 and describe what it represents.
−60 contestants per round, and it represents the average rate at which the number of contestants changed from the second round to the fourth round
−120 contestants

Question

HELP WILL MEDAL
Question 8 (Multiple Choice Worth 1 points)

(04.03)

A dance competition on television had five elimination rounds. After each elimination, only one-fourth of the contestants were sent to the next round. The table below shows the number of contestants in each round of the competition:

x	1	2	3	4	5
f(x)	512	128	32	8	2

Compute the average rate of change of f(x) from x = 2 to x = 4 and describe what it represents.
 −60 contestants per round, and it represents the average rate at which the number of contestants changed from the second round to the fourth round
 −120 contestants

mathmale · Answer

There's a formula for "average rate of change" that is pretty much the same as the familiar "slope of a straight line" formula.

Do you know this formula?

mrs.ambrose614 · Answer

C.-60 contestants per round,and it represents the number of contestants who will reach the final round.
D.-120 contestants per round,and it represents the number of contestants who will reach the final round

mrs.ambrose614 · Answer

@mathstudent55 no I donot know the formula

mrs.ambrose614 · Answer

M=y2-y1/x2-x1 is that the formula???

welshfella · Answer

the formula is  f(n) - f(m)
                       --------
                          n - m


where n and m are the 'x values'  and   f(n) and f(m) are the values of the function  when x = n and x = m.

mrs.ambrose614 · Answer

Can u help me

3mar · Answer

Are you familiar with that?

welshfella · Answer

yes 
just plug in the given values in the formula
y2 = 128 an y1 = 8
what is x1 and x2?

mrs.ambrose614 · Answer

X1=12 and x2=4?????

mrs.ambrose614 · Answer

@welshfella

welshfella · Answer

x1 = 2 and x1 = 4

mrs.ambrose614 · Answer

Wait no X1=2 and x2=4

welshfella · Answer

giving 128 - 8  / 2-4

mrs.ambrose614 · Answer

So now when I get that what do I do????? @welshfella

welshfella · Answer

work it out 
(128 - 8) / (2-4) =  ?

mrs.ambrose614 · Answer

The ANWSER is -60

mrs.ambrose614 · Answer

But wich negative sixty would it be???? @welshfella

mrs.ambrose614 · Answer

-60 contestants per round,and it represents the number of contestants who will reach the final round??????

welshfella · Answer

remember - you are working out an average rate.

mrs.ambrose614 · Answer

So the ANWSER would Ben he one I just sent you???

mrs.ambrose614 · Answer

Or the one I posted with the question??

welshfella · Answer

does your answer say the -60 is an average rate?

mrs.ambrose614 · Answer

The first one dos

welshfella · Answer

then you know the answer