Subtract using the number line.
−1 1/3−1/6
a number line ranging from negative two to two with an arrow on both ends and tick marks every one sixth
−1 5/6
−1 1/2
−1 1/6
1 1/2

Step-by-step explanation:

A part of the number line ranging from -2 to 2 with an arrow on both ends and tick marks every is shown in attached diagram.

Rules:

To subtract using number line, you have to move to the left one mark (because the distance between two consecutive marks is ), so you'll be at point

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)

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.