12. solve and circle all answers that apply. 1x1 - 1 - 10
a
b)
x=-9
x=9
c)
d)
x = -11
x = 11

Option D is correct.

Step-by-step explanation:

We have to solve an equation with absolute value function.

The equation is |x| - 1 - 10 = 0

⇒ |x| = 11

⇒ x = 11 or -11 (Answer)

This is because |x| gives the absolute value of any value of x.

The definition of |x| can be given as  

|x| = x , when x ≥ 0 and |x| = - x, when x < 0.

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.