Find five pairs of numbers, such that when they are inserted into the equation below the solution of the equation is 2/5

Rewrite the following without an exponent. (5/8)-1

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

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?