Please help Show work

A 55
B 20
C 38
D 70

x = 16

Step-by-step explanation:

Both the angles are complementary (add up to 90°)

=> (4x - 10) + (x) = 90°

=> 5x + 10 = 90°

=> 5x = 80°

=> x = 80/5

=> x = 16

Hope this helps!

x = 20

Step-by-step explanation:

→ Recall how many degrees on a straight line

180°

→ Form an equation

90 + 4x - 10 + x = 180

→ Simplify

80 + 5x = 180

→ Minus 80 from both sides

5x = 100

→ Divide both sides by 5

x = 20

the answer is 62.8 cubic units