Question

4. Jeff is getting his first cell phone.

The plan he has chosen has an initial
fee of $35 plus a charge of $0.25 per
minute. This plan can be represented
by the function f(x) = 0.25x + 35. How
much money will Jeff pay this month
if he uses 250 minutes?

Answer 1

$97.50

Explanation:

To evaluate a function, replace the variable in the function definition with the value you want to evaluate it for.

f(x) = 0.25x +35 . . . . for x=250

f(250) = 0.25·250 +35 = 62.50 +35

f(250) = 97.50

Jeff will pay $97.50 if he uses 250 minutes.