Acredit card offers an apr of 15.83% and compounds interest daily. which is it most likely to advertise, it’s a apr or effective interest rate?

Me because some of question i don’t understand

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?

25) 56(1) = 5b a. identity property of addition b. identity property of multiplication c. commutative property of multiplication d. commutative property of addition