What is the slope for all 3 lines

Can anyone me with 32,33,36,37,and 40.

Find the zeros of each function. f(x) = x^2 + 5x - 6

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