explain please too! i really am struggling with this and I don't know how the results are achieved. thanks!

Angle 1 = 180°-99° (adj angles on a str line)

= 81°

Angle 2 = 99° (vert opp angles)

Angle 3 = 81° (vert opp angles)

Angle 4 = 99° (corr angles, a//b)

Angle 5 = 81° (corr angles, a//b)

Angle 6 = 99° (corr angles, a//b)

Angle 7 = 81° (corr angles, a//b)

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.