Which pairs of angles are supplementary?

a. 1 and 6

b. 2 and 3

c. 5 and 8

d. 5 and 7

Supplementary angles = Angles that add up to 180°. 

∠5 + ∠7 = 180° ← supplementary angles

∠1 = ∠5 
Since ∠5 + ∠6 = 180°
⇒ ∠1 and ∠6 will also be 180° .  ← supplementary angles


∠5 + ∠7 (Answer D) and ∠1 + ∠6 (Answer A) 

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.