Answer:
x=13
Step-by-step explanation:
Angle A and angle B are supplementary
Supplementary angles add to 180 degrees
<A + <B = 180
7x-18 + 8x+3 = 180
Combine like terms
15x -15 = 180
Add 15 to each side
15x-15 +15 = 180+15
15x = 195
Divide by 15
15x/15 =195/15
x =13
Yes
59
52+17-10=59
EF=22
C=70°
B=110°
Trapezoids have to have a total of 360° and there are complementary angles.
{3x-2}+4=10
