The angle made by any right angle is 90° and the angle made by a straight line is 180°. These are the main equations required to solve the values of x. The first 2 are right angles and the last 2 are straight lines. So the sum of the components within that right angle is 90° and for a straight line is 180°.
If they are 2.5 inches tall and the back splash is 2.5 feet tall that means you can fit 12 tiles vertically. 6 inches is 1/2 of a foot so 16 tiles can fit horizontally in 8 feet. 12 x 16 = 192 Final answer: 192 tiles Hope I helped :)