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:
[tex]65+85\cdot{x}[/tex]
and if you have $320 we can make the expression equal to 320:
[tex]65+85\cdot{x}=320[/tex]
We can solve x:
[tex]85\cdot{x}=320-65[/tex]
[tex]85\cdot{x}=255[/tex]
[tex]x=255/85=3[/tex]
You can afford 3 hours of work
