Sam makes $400 per week plus $20 commission on each new sell phone plan he sells. write an equation to determine how many new plans she sold to earn $680 last week

She sold 14 new plans to earn $680 last week.

Step-by-step explanation:

$400 + 20(x) = $680

Take 400 away from total cost. So, 680 - 400 = 280.

Now, divide 280 by 20, and x = 14.

The equation would be $400 + 20(14) = $680

536

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.