Question 21 of 25 Which expression is not a polynomial?
O A. 5x2 + 4x + 1
O B. x2 - x-12/X +3
C. 4- 3x + 5x5
D. 8x10 + 2x5

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32