The function below can be used to calculate the cost of making a long distance call, f (m), which is based on a $2.50 initial charge and a fee of $.12 per minute, m, that the call lasts. If Natalie paid $6.82 for one call, how many minutes long was it?

Question

Mathematics

Journey Pham

Today, 08:28

The function below can be used to calculate the cost of making a long distance call, f (m), which is based on a $2.50 initial charge and a fee of $.12 per minute, m, that the call lasts. If Natalie paid $6.82 for one call, how many minutes long was it?

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Answers (1)

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Gemma Tate · Answer 1

F (m) = 2.5 + 0.12m

if Natalie paid $6.82

6.82 = 2.5 + 0.12m

0.12m = 6.82 - 2.5

0.12m = 4.32

m = 4.32 : 0.12

m = 36

The call was 36 minutes long.