Question

A) x = 7
B) x = 11
C) 3x+28 - 5x+52 + 2x-10 = 360x = 15
D) x = 20

Answer 1

B) x = 11

Explanation:

The three angles of a triangle always add up to 180°

3x+28+5x+52+2x-10

= 180

Combine like terms.

10x + 70 = 180

subtract 70

10x = 110

divide by 10

x = 11