What you can do: (n)a=(n)(4+1/n) Know divide away each n on respective side you get: a=4+1/n Know when n=0, 1/0 is not defined there’s that n=1 , 4+1/1 = 5 n=2 , 4+1/2 = 4.5 n=3 , 4.33 n=4, 4.25
V = x/t = 4.5 mil / 3 h = 1.5 mph Since, v = 1.5 mph (or we can say that v is constant), distance and time vary directly and the constant of variation is 1.5 mph.