The function f (x) = 0.11x + 43 relates how much Derek pays for phone service, f (x), to the number of minutes, x, used for international calls in a month. What is the value and meaning of f (320) ?

Question

Cassie Stout

Mathematics

2 March, 06:35

The function f (x) = 0.11x + 43 relates how much Derek pays for phone service, f (x), to the number of minutes, x, used for international calls in a month. What is the value and meaning of f (320) ?

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Journey · Answer 1

F (x) = 0.11x + 43

f (320) = 0.11 (320) + 43

f (320) = 35.20 + 43

f (320) = 78.20

so the value of f (320) is 78.20 ... and this is saying that for 320 minutes, his phone service would charge him $ 78.20