The points (-1,4) and (2,r) lie on the line with slope -3. find the missing coordinate r. r=?

r=-5

Step-by-step explanation:

-3=r-4/2-(-1) (plug into the slope formula)

-3=r-4/3 (solve the denominator)

-9=r-4 (multiply both sides by 3)

-5=r (add 4 to both sides)

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