Question

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)?

Answer 1

answer:
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

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

Answer 2

The value of f(320) = $78.2.

And the meaning of f(320) is the the amount $ 78.2 Derek pays for 320 minutes of international calls.

Explanation:

Given the function: f(x) = 0.11x + 43 ......[1]

where;

x represents the number of minutes used for international calls in a month and

f(x) represents the cost.

Find the value of f(320);

Substitute the value of x =320 in [1] we have;

`f(320) = 0.11(320) +43`

or

`f(320) = 35.2+43 = 78.2`

Therefore, the value of f(320) is, $78.2.

The meaning of f(320) means that $78.2 is the amount Derek pays for 320 minutes of international calls.