4. 2/5÷5
5.1/3÷7
6.3/8÷3
7.4 4/5÷2 1/3
8.7/9÷12 1/2
9. 9/13 × 17 answer them all right with work and you get brainliest. and good points.

what graph

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.