Hello, I just want to say thank you so much to :) There are so many times I have misunderstood things on my homework and has helped me out! My grades are great in general, but has always helped me check my work!
Comment a tight spot in which saved you for free points! :o)

I totally agree

Step-by-step explanation:

It helps a lot.

^^

Step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0