#1**+2 **

Complementary angles sum to 90°

x + 5 + 4x - 15 = 90

5x - 10 = 90 add 10 to both sides

5x = 100 divide by 5

x = 20

Thanks to tertre for spotting my stupid error....!!!

CPhill Dec 3, 2018

#4**+1 **

Best Answer

Complementary angles sum to 90°

x + 5 + 4x - 15 = 90

5x - 10 = 90 add 10 to both sides

5x = 100 divide by 5

x = 20

Credit to CPhill

He is the best

Guest Dec 3, 2018

#7**+2 **

If they are complementary angles, then x+5+4x-15=90

5x-10=90

5x=100

x=20

The value of x is 20.

(i was too lazy to do LaTeX lol)

You are very welcome!

:P

CoolStuffYT Dec 3, 2018