"Tell your friends it was nice to meet them, but I hope I never see them again." Is this sentence simple, compound, or complex?

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?