Travis can lay a slab of concrete in 20 hours while devante can do it in 12 hours. IF travis and devante work together how long will it take them

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

c. side angle side. u shares the same sides

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.

a: inscribed angles

step-by-step explanation:

i reviewed this question with a peer and teacher, seems to be correct, me later