Answer:
he would have to get an 81
Step-by-step explanation:
To get X by itself you first bring -7 over and get X/5=-1 then multiply both sides by 5 to get X=-5
2000. Because if you add the 2 it will make 1200, 2+8 is 10 so you carry the 1, and 3+9 is 12 then you add the 1 you got from 10 and you have 13. then you add 1+1 and get 2 and add the 1 you got from 13 so there you have it.
The exterior angle theorem states that an exterior angle is equal to the sum of its remote interior angles.
So...
80+20=m<CAD
m<CAD=100°