Answer :
Given:
A repair service charges $45 for a house call and an additional $50 per hour of work.
the formula
[tex]T=45+50H[/tex]represents the total charge T for H hours of work.
Required:
To find the hours if the total bill for a customer was $270.
Explanation:
Here T=270$.
Now
[tex]\begin{gathered} T=45+50H \\ 270=45+50H \\ 50H=270-45 \\ 50H=225 \\ H=\frac{225}{50} \\ H=4.5\text{ hours} \end{gathered}[/tex]Final Answer:
There were 4.5 hours of actual labor.