Question

Justin is going to use a computer at an internet cafe. The cafe charges $0.20 for every minute using a computer on top of an initial charge of $4. Write an equation for the function

C(t), representing the total cost of using a computer for
t
t minutes at the internet cafe.

Answer 1

An equation for the total cost of using a computer for t minutes is
`C(t)=4+0.20t`

Explanation:

Fixed charge of using computer = $4

The cafe charges $0.20 for every minute

We are supposed to find the total cost of using a computer for t minutes

Cafe charges for 1 minute = $0.20

Cafe charges for t minutes = $0.20t

So, Total charge = Fixed charge +0.20t

Total charge =4 +0.20t

We are given that C(t), representing the total cost of using a computer for t minutes

So,
`C(t)=4+0.20t`

Hence an equation for the total cost of using a computer for t minutes is
`C(t)=4+0.20t`