What’s the value of X here in this equation?

Step-by-step explanation:

The sum of the interior angles of a triangle is 180 degrees.

5x + 2 + 2x - 8 + 39 = 180

7x + 33 = 180

Subtract 33 to both sides

7x = 180 - 33

7x = 147

Divide both sides by 7

x = 147 / 7

x = 21

Hope this helped!

~AH1807

The surface area for this case is given by:
 A = 2 * pi * r ^ 2 + 2 * pi * r * h
 Where,
 r: radius of the coins
 h: height of the coin stack.
 Substituting values we have:
 A = 2 * 3.14 * (1/2) ^ 2 + 2 * 3.14 * (1/2) * (100 * (1/8))
 A = 40.82 in ^ 2
 Note: the correct thickness of the coins should be 1/8 in.
 
 Jose will need 40.82 in ^ 2 to cover the stack of coins