Given the right triangle shown solve for X Y and Z the right may not be drawn to scale

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

2x minus y equals 6, x plus y equals negative 3