Helpp please will give brainliest

What is f(3) for the quadratic functionf(x)=2x2 + x – 12? f -3g 3h 6i. 9

I’m stuck on this equation, anyone got the answer?

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