Question

Another one, help!! pic included

Answer 1

the answer is 9

Explanation:

If you just try multiplying with every number, you'll eventually find the right one.

Answer 2

Since all angle measures in a triangle MUST equal 180°, we can set up an equation to solve for x.

`13x + 2 + 5x - 7 + 3x - 4 = 180\\\\21x - 9 = 180\\\\21x = 189\\\\x = 9`

Our answer is x = 9.