3. Liam, Anika, and Sai are each solving the same equation for x. Describe the first step they each make for the equation.
Original equation: 12x + 4 = 20x - 12
3.1 The result of Liam's first
step was 4 = 8x - 12.
3.2 The result of Anika's first
step was 3x + 1 = 5x - 3.
3.3 The result of Sai's first
step was 12x + 16 = 20x

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.