Solve for fff: f\div -\dfrac{2}{3}= -\dfrac{1}{3}f÷−
3
2

=−
3
1

f, divided by, minus, start fraction, 2, divided by, 3, end fraction, equals, minus, start fraction, 1, divided by, 3, end fraction
f =\,

idk

step-by-step explanation:

use that smart brain

your answer would be 12

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.