Is it a b c or d I need help

(2x+60)+(3x+20)=180

5x+80+180

5x=180-80

5x=100

x+100/5

x=20

Again,

2x+60=2*20+60=100

3x+20=3*20+20=80

Step-by-step explanation:

The sum of co-interior angle= 180 degree.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²