Which one doesn't belong why?

If the measure of xyz is 81 what is the measure of yz

Which expression is equivalent to 3^3 + 2^2?

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick