Question

The relationship between the monthly fee that the cable company charges for internet service and the fee for downloading over 32KB of information is modeled by the linear function f (x) = 1.25x + 45, where x is the number of KB over 32. If the total bill for a month is $170, how many KB was in excess of 32 KB that month?

Answer 1

1.25x = 170-45
1.25x = 125
x = 100

Answer 2

100 Kilobytes.
Because if the total is 170, then
1.25x = 170-45
1.25x = 125
x = 100