Which expression is equivalent to ? Select all that apply.

A
(−83) ÷ (−14)\left(\frac{-8}{3}\right)\ \div\ \left(\frac{-1}{4}\right)(
3
−8

) ÷ (
4
−1

)

B
38÷ 14\frac{3}{8}\div\ \frac{1}{4}
8
3

÷
4
1


C
38 . (−4)\frac{3}{8}\ .\ \left(-4\right)
8
3

. (−4)

D
(−38) . (−4)\left(\frac{-3}{8}\right)\ .\ \left(-4\right)(
8
−3

) . (−4)

E
(−83) . (−4)\left(\frac{-8}{3}\right)\ .\ \left(-4\right)(
3
−8

) . (−4)

the answer is 99.

x-3y=4

step-by-step e

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.