Question

Two angles are complementary. The measure of ∠ABC is x° and the measure of ∠DBC is (3x + 10)°. What is the value of x?

Answer 1

42.5 I think

3x+10+x=180
4x=170
170/4=x
X=42.5

Answer 2

x= 20

Explanation:

Information needed:

Complementary angles add up to 90°

Angle ABC= x°

Angle DBC= (3x+10)°

Equation:

x+(3x+10)= 90

Solve:

x+(3x+10)= 90

x+3x+10= 90

4x+10= 90

-10 -10

4x= 80

/4 /4

x= 20