Answer:
9x - 5
Step-by-step explanation:
<u>Simplify:</u>
- (4x − 6) + (5x + 1) = ⇒ opening parenthesis
- 4x - 6 + 5x +1 =
- (4x+ 5x) + (1 -6) = ⇒ grouping like terms
- 9x + (- 5) = ⇒ simplifying like terms
- 9x - 5 ⇒ answer
<u>Correct choice:</u> B. 9x -5
Two angles are complementary when their sum is equal to 90°.
So, ( 2x + 39 ) + ( 7x - 21 ) = 90°
9x + 18° = 90°
x = 8°
Putting value of x in the angles given :
( 2x + 39 )° = 2(8°) + 39° = 55°.
( 7x - 21 )° = 7(8°) - 21° = 35°.
Therefore, the angles are 55° and 35°.
Hence, this is the required solution.
Any 2 adjacent angles whose outer angles form a straight line are considered supplementary
