One summer, Jared earned $26 each time he mowed the lawn. He mowed the lawn a total of 13 times that summer. He had to fix his lawn mower one time during the summer, which cost him $32.42.

Which number sentence could be used to find M, Jared's profit for the summer including the loss he took when he had to fix his mower?

(26 * 13) - 32.42 = M

Your problem is flawed, though. Assuming he used a gasoline-powered mower, the cost of his gas should also come from his earnings.