Answer:
m∠Y = 34°
Explanation:
We know what the sum of the angles is, so we can use that to write an equation that we can solve for x. Knowing x, we can find the measure of angle Y.
The sum of angle measures is 180°, so we have ...
m∠W + m∠X + m∠Y = 180°
(7x+8) +(2x -15) +(2x +0) = 180
11x -7 = 180 . . . . . collect terms
11x = 187 . . . . . . . add 7
x = 17 . . . . . . . . . . divide by 11
The measure of ∠Y is ...
m∠Y = 2x+0 = 2·17 = 34 . . . . . degrees