The 4-by 100 meter relay is a track and field event involving four runners on each team.
runner - carter frater bolt powell
time - 13.4 12 12 11.7
a. what is the combined time of carter and frater?
b. how much faster did powell run his leg of the race than bolt?
c. what is the combined time of all the runners?

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.

3xy cannot be combined with the others

2x, -5x and x are like terms