Solve the eqaution x=(4)/(3)\pi r^(3) for r

Can someone check my answer? you : )

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1