THE ANSWER IS 70 !!
When you add up all the sides to get 290 and the total amount of the angles is 360 so you subtract 290-360 and you get 70
The answer is D. 48.
(3 x 40) + (3 x 8)
120 + 24
144
3 x Y = 144
Divide 144 by 3
144 / 3 = 48.
So the answer is 48.
Hope this helps!!
