Confused! which letter is the mistake?

Atriangle has side lengths of 15 inches and 30 inches. it also has angles that measure 45º and 20º. which of the following identifies the possible third angle of the triangle? a. 15 in., 65º b. 45 in., 65º c. 17 in., 115º d. 14 in., 115º

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

What is the total surface area of this square pyramid?