Answer:
a = 12
b = 20
c = 5
Step-by-step explanation:
1) First you need to know the rule that angles on a straight line add up to 180° because it is like doing a line straight through the middle of a circle (360°) so it is just half of 360°
2) Knowing this you know can form the question of 100°+16c° = 180. Do the opposite of +100° so instead -100°. so that would be 180-100 = 80°.
3)16c° = 80 now do the opposite of 16 x c and do 80/16 = c=5
4) 5b + 16c = 180° or because we now know that c = 5 it is 5b + 16(5) = 180°
180 - 16(5) = 100° 5b=100 100/5=20
5) 5(20) + (5a+20) = 180 180-5(20) = 80 5a+20=80 80-20=60 60/5=12
