Charlene will need \(286\) square inches of wrapping paper.
To calculate the amount of wrapping paper needed, you need to find the surface area of the box.
- Surface Area of a Rectangular Prism: \(SA = 2lw + 2lh + 2wh\)
- Substitute the given dimensions: \(SA = 2(7*5) + 2(7*9) + 2(5*9)\)
- Calculate the total: \(SA = 70 + 126 + 90 = 286\) square inches
Therefore, Charlene will need \(286\) square inches of wrapping paper.