Answer:
x = 15
W = 30
Step-by-step explanation:
There are 360 degrees in a rectangle. So the sum of all 4 angles should add up to 360. Use algebra to solve for x.
10x + 6x + 6x + (3x-15) = 360
25x - 15 = 360
25x = 375
x = 15
Plug in x = 15 to solve for W.
3(15) - 15 = 30
