The wheels on annie's bicycle are $20$ inches in diameter. if each wheel makes $3$ full revolutions every second, then how many feet does annie travel in $1$ second? give your answer as an integer, rounded to the nearest foot.

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