Book Maths Puzzle Percentage

The formula used to calculate the percentage of body fat for men is %Body fat = (-98.42 + 4.15w -0.082b)/b. What is the body fat for a man weighing 156(b) pounds and waist measurement(w) 32 inches.

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Book Other Question

A large awning is being designed for a hotel entrance and drive. The roof is to be a section of a parabola, with the vertex attached to the hotel wall 16 feet above the ground, and supported by 10 foot wall posts that are 12 feet away from the hotel wall.
Come up with a general equatation of a quadratic function that would model the roof of the awning.

Thanks for ANY help. I'm completely stuck on how to go about this problem algebraically.

Noelle
marknoni@comcast.net A rectangular yard is surrounded by a fence that is 4 feet longer than it is wide. If the perimeter of the fence is 424 feet, what are the dimensions of the yard it encloses?