Find the ratio of 3 km to 3000 m

Which of the following is the inverse of y = 3∧x y = 1/3∧x y = ㏒3x y = (1/3) ∧x y = ㏒ 1/3∧x

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.