Answer: y=90 degrees, x=45 degrees, and z=45 degrees.
Step-by-step explanation: A whole triangle equals 180 degrees. Angle y is a right angle and a right angle is 90 degrees. so 180-90=90, there are the two angles left, x and z which have to equal 90 degrees also x being acute so we have to divide 90 degrees by 2 which equals 45 so leading y=90 degrees, x=45 degrees, and z=45 degrees.