#1**+1 **

This is just algebra in disguise.

Since the 4th angle is equal to 3x + 7 degrees, and the 5th angle is equal to 9x-43 degrees, we can form a linear equation and solve.

3x + 7 + 9x - 43 = 180 <------- 180 degrees on a line

12x + 7 - 43 = 180

12x - 36 = 180

12x = 216

x = 18

To solve for UPS, we plug 18 into the 4th angle.

3(18) + 7 = 61

But, we also need to add 90 degrees:

61 + 90 = **151 degrees**

Maybe you actually will see this answer. Maybe not, as you are a guest, and you can't save topics.

:)

ilorty Aug 28, 2020