Book Maths Puzzle Area and Volume

You want to make a vertical file by bending the long side of an 8x14 inch sheet of metal along two sides to make a U shape. Express the volume of the file as a function of the height. Find the domain and range of the resulting function. How tall should the file be in order to maximize the volume that it can hold?

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Book Other Question

Solve for x
x^2 + 3x + 3 = 0 Q1. The speed of a stream is 6MPH. If a boat travels 92 miles downstream in the same time that it takes to travel 46 miles upstream, what is the speed of boat in still water. ( I know the answer is 18 MPH, just need to know the solution)

Q2. Martha can rake the leaves in her yard in 2 hours. Her younger brother can do the job in 3 hours. How long will it take them to do the job if they work together. ( I know the answer is 5/6 hours, just need to know the solution)