Answer:
9
Step-by-step explanation:
Answer:
14 is C I believe............
Every triangle is 180 degrees, so each other angle should have 20
FOIL
First = 6x(2x) = 12x
Outside = 6x(-3) = -18x
Inside = -5(2x) = -10x
Last = -5(-3) = 15
12x - 18x - 10x + 15
12x - 28 + 15
-16x + 15
Hope this helps =)