Help what are the cells labeled A and B

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Ineed someone to me answer my question i have to have this done and knocked out

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?