Answer:
The expression is Total payment = (x + 6)(2x - 11)
Total amount paid = $243 at x = 12.
Explanation:
Leo worked for (x + 6) hours at pizzeria. He was paid (x - 6) dollars per hour.
Therefore payment to Leo = number of hours worked × rate of payment = (x + 6)(x - 6)
Similarly payment done to Leo's friend Frankie = (x + 6)×(x - 5) dollars
Total payment received by both = (x + 6)(x - 6) + (x + 6)(x - 5) = (x + 6)(x - 6 + x - 5) = (x + 6)(2x - 11)
If x = 12 then we have to find the total amount paid.
Total payment = (12 + 6)(2×12 - 11) = 18×13 = $234