1) 2 -7-19
2x=19+7
2x=26
X=13
2) +5=12
-x/3+5=12
-x+15=36
-x=36-15
-x=21
X=-21
3)x-5=4
3x-20=16
3x=16+20
3x=36
X=12
To find a you divide 90 by 2 which equals 45. So a=45
A circle has 360 degrees. So you add 90 and 110 together and get 200 degrees. So to find the rest you subtract 200 from 360.
360-200=160 degrees.
To find b we divide 160 by 2 and that equals 80. So b=80.
a+b=45+80=125.
The answer is B
493k is correct B was the one that I think is right
Sry i can’t help that much 1-562 star rating but it doesn’t seem like