I NEED HELP FOR MY ASSIGNMENT AND MAKE SURE TO WRITE THE ANSWER AND EXPLAIN

4 + 5 7/9= 9 7/9

step-by-step explanation:

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

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.

for future students the answer is b

hope i

-lavira: )