Which expression is equivalent to (5-2i)^2-i^3 where i^2=-1?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?

Can you me find the slope! (30 points)