Due tonight!

find each function value for the given function rule.

a. f(7) if f(x) = 5x

b. f(9) if f(x) = x + 13

c. f(4) if f(x) = 3x - 1

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