Question

Jabari is power washing houses for a summer job. For every job, he charges an initial fee plus $30 for each hour of work. His total fee for a 4-hour job, for instance, is $170.

Jabari's total fee, ff, for a single job is a function of the number, t, of hours it takes him to complete the job.
Write the function's formula.

Answer 1

The answer is f = 30t + 50

Explanation:

Look at attachment:

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Answer 2

Answer:
`f=30t+50`

Explanation:

Given: Jabari's total fee, f, for a single job is a function of the number, t, of hours it takes him to complete the job.

For every job, he charges an initial fee plus $30 for each hour of work.

let m be his initial fee.

Then
`f=30t+m`.......(1)

Also, his total fee for a 4-hour job, for instance, is $170.

Put t=4 and f=170 in (1), we get

`170=30(4)+m\\\Rightarrow170=120=m\\\Rightarrow\ m=170-120\\\Rightarrow\ m=50`

Now, put m=50 in the (1), we get the function's formula for Jabari's total fee, f as

`f=30t+50`