Question

Which of the following functions represents a cell phone bill if there is a monthly charge of 20 dollars plus 6 cents for each minute of use? f(x) = 20 + 6x f(x) = 20.06x f(x) = 20 + 0.06x

Answer 1

It would be f(x) = 20 + 0.06x

Answer 2

Option 3rd is correct

`f(x) = 20 + 0.06x`

Explanation:

Let x be the time in minutes and f(x) be the cell phone monthly bill.

Given the statement:

if there is a monthly charge of 20 dollars plus 6 cents for each minute of use

Use conversion:

1 cent = 0.01 dollars

6 cents = 0.06 dollars

"
`\text{0.06 dollars for each minute of use}` means 0.06 x

then;

the function represents a cell phone monthly bill is given as:

`f(x) = 20 + 0.06x`