John takes 3 days off of streaming per week.  On the days he does stream, he streams for 4 hours at a time and makes $10 an hour.  How much does he make a week?
He streams for 7-3=<T>subtract(7, 3)=4 days a week
So he streams 4*4=<T>multiply(4, 4)=16 hours a week
That means he makes 16*10=$<T>multiply(16, 10)=160 a week
