Question

A plumber charges $70 per hour plus $40 dollars for the call. What does he charge for 4 hours of work

Answer 1

First, let's create an equation for this problem. 
($70 × 4) + $40

Now, all you would have to do is solve it using the order of operation (PEMDAS).
($70 × 4) + $40 = $280 + $40
$280 + $40 = $320

The plumber charged $320. 

I hope this helps!

Answer 2

use formula y=mx+b, where y equals total fees, m equals hourly cost(70), and b equals the cost of call(40). y=70(4)+40.
                                              y=280+40
                                              y=320, so he charges $320 for 4 hours of work.
hope this helps you!