Given the sequence is geometric a10 equal 78,732 and the common ratio is 3 find a1

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

How do i do this activity, is appreciated

17 in long 1.3 ft wide and 8in high what is the volume