10 Points Which is a simplified form of the expression 16 - 12a - 20 + 6a? A. -10a
B. – 6a – 4.
C. 4a – 12
D. 18a + 36

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1

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.

6

step-by-step explanation: