Simplify the following expression using x = 2 and y = 5.
3x + 4y − 1
A school decides to sell cookie dough for $5 per tub, as a fundraiser. Last week, Sam sold 8 more tubs than this week. If Sam’s sales total $160 for both weeks, how many tubs of cookie dough did Sam sell last week?
Justin went to the new trampoline indoor park. They charge a $15 one time registration fee and $13 for every 60 minutes. Justin spent $54. How long was he in the park?