Which equation is true? (6 + 14) + 9 × 3 = 6 + (14 + 9) × 3
(6z × 14) × 9 + 3 = 6z × (14 × 9) + 3
(6z + 14) + 9 × 3 = 6z + (14 + 9) × 3
(6 × 14) + 9 × 3 = 6 × (14 + 9) × 3

wow

Step-by-step explanation:

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.