Answer:
Step-by-step explanation:
3(x +6 ) = -18
Divide both sides by 3
3(x+6)/3= -18/3
x +6 = - 6
Subtract 6 from both sides
x + 6 - 6 = - 6 - 6
x = - 12
Step-by-step explanation:

Replace with given values, so

Multiply both sides of the equation by


Cancel common factor of


Exact value of cos(60) is 1/2
Cancel common factor of 2

or


In the given question, the two angles are complementary Angle pair, so the sum of their values will add up to 90°
that is ~





