Answer:
Step-by-step explanation:
A) (1+2x)-(2-3x)=
3x 1x = 2x
B) (-3+5x)-(-4x-5)
2x 1x = 1x
C) (x+1)-(-4x-5)
1x 1x x
To find a,construct a line that parallel to AB and DE cutting c, which you could refer to the photo((sorry for my terrible diagram ^^;;
from the photo,we can see that
a= <BCG + <GCE
<BCG=44° (alt.<, AB//FG)
<GCE=20° (alt<, FG//DE)
thus,a= 44°+20° =64°
hope it helps!
172,000 is the answer I think