Question

Don't know how to solve​

Answer 1

x=12

Explanation:

Knowing that everything is given adds up to 90º(because the angle is a right angle), we can easily solve for x.

(x+42)+3x=90

Gather like terms.

4x+42=90

Subtract 42 from both sides of the equation.

4x=48

Divide 4 from both sides of the equation.

x=12

Hope this helps :)

Answer 2

(x+42)°+3x°=90°

x+42°+3x°=90°

x+3x°+42°=90°

4x°+42°=90°

4x°=90°-42°

4x°=48°

x°=48°/4

x°=12°