The function f(x)= 0.11 x + 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)?

f(320)= how much Dereck pays for phone service if he calls  320 minutes.

F(320)=0.11(320)+43=35.2+43=78.2

the value of f(320) is $78.2 and it will be the cost of phone service for 320 minutes of international calls.