(Please only answer if you know the answer) In two or more complete sentences, explain how to find the time it takes for a rocket following the path of the parametric equations, x = 3t^2 and y = -9t + 18, to hit the ground

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18