Janice bought a book for $4.00. she also bought 5 pens. she spent a total of $39.00. how much did each pen cost?

Aswimming pool measures 22ft by 12ft and is 4ft deep. if the pool is being filled at 2.5 cubic ft per minute, how long will it take to fill the pool?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?