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**calculuslyfrustrated** I can't figure these two problems out for the life of me...this is my last resort lol.

A parcel delivery service will deliver a package only if the length plus the girth (distance around) does not exceed 112 inches. Find the maximum volume of a rectangular box with square ends that satisfies the delivery company's requirements.

and

A fence is to be built to enclose a rectangular area of 300 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 15 dollars per foot. Find the length and width (with ) of the enclosure that is most economical to construct.

Any help would be GREATLY appreciated.

Thanks,

Will