I really can't figure out what this problem is telling me to do. I've tried for the last 20 minutes but I just don't know how to make the function and I don't know where to start. Please help!

* * *

A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions

*W* inches by

*L* inches by cutting out equal squares of side

*x* at each corner and then folding up the sides. (

*W* =

14 in. and

*L* =

25 in).

(a) Find a function that models the volume

*V* of the box.

(b) Find the values of

*x* for which the volume is greater than

240 in

^{3}. (Give each answer correct to three decimal places.)

(c) Find the largest volume that such a box can have. (Round your answer to three decimal places.)

* * *

Thank you in advance for your help!