Answer:
3 hours
Step-by-step explanation:
If the initial charge for the diagnostic check is $65 and you pay $85 for every hour of work then we can write the following expression with x being the number of hours worked:
\(65+85\cdot{x}\)
and if you have $320 we can make the expression equal to 320:
\(65+85\cdot{x}=320\)
We can solve x:
\(85\cdot{x}=320-65\)
\(85\cdot{x}=255\)
\(x=255/85=3\)
You can afford 3 hours of work
