HELP PLEASE FOR MATH TEST REVIEW

Average rate of change; 1

Step-by-step explanation:

1. Find the end-points of the given interval

Input (-9) and (0) into the equation.

Input (-9)

81 - 90 + 20

11

point is; (-9, 11)

Input (0)

0 + 0 + 20

20

point is; (0, 20)

2. Find the slope

Now find the slope between the two points, the equation for the slope is;

Substitute in the points;

-

= -1

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)