Charlie bought 6 new books for his collection. This increased his collection by 12%. How many books did he have before his purchases?

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Find the value of x for which the lines are parallel.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.