AND PROBLEM SOLVING

Write a problem for a classmate to solve. Devise

the problem so the answer is "The Rothmans can

drive $90$ mi without exceeding their truck rental

budget."

Ski wax. Green ski wax works best between $5$

and $15$ Fahrenheit. Determine those Celsius

temperatures for which green ski wax works best

$($See Exercise $39.)$

Parking fees. Mack's Parking Garage charges $$4\mathrm{.}00$

for the first hour and $$2\mathrm{.}50$ for each additional

hour. For how long has a car been parked when the

charge exceeds $$16\mathrm{.}50?$

question $61$ please!