PLEASE HELP WILL MARK BRAINLIEST!
Erik solved the average rate of change of f(x) over the interval from x = 6 to x = 10 this way : (10 - 6)/(18 - 8) = 4/10 = 2/5 * X His answer is not correct though. Please complete parts a & b to earn full credit.
a. Explain exactly what erik did wrong in his work
b. Show your work to solve the average rate of change correctly

He did the equation backward. He did , which is wrong.

The actual equation for average rate of change is:

Answers are below

Step-by-step explanation:

A) Erik did not use the correct points. When you use an x value, also use the f(x) value that goes with it. Erik chose random numbers to show the rate of change.

B) I chose two x values and the f(x) value that go with them. = is the rate of change.

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

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