Question

4x-30 and x-15 are complementary pairs then what is x

Answer 1

4x-30+x-15=90 degree
5x-45=90
5x=90+45=135
x=135/5=27

Answer 2

Complementary pairs are pairs of angles that add up to 90° since a complementary angle's measure is 90°.

4x - 30 and x - 15.

Adding both of them to get the result 90,

4x - 30 + x - 15 = 90

5x - 45 = 90

5x = 90 + 45

5x = 135

x = 135/5

x = 27°

Therefore the value of x is 27°

Hope it helps :)