-A rain gutter is made from sheets of aluminum that are 20 inches wide by turning up the edges to form right angles. Determine the depth of the gutter that will maximize its cross- sectional area and allow the greatest amount of water to flow. What is maximum cross-sectional area?

1-A rain gutter is made from sheets of aluminum that are 20 inches wide by turning up the edges to form right angles. Determine the depth of the gutter that will maximize its cross- sectional area and allow the greatest amount of water to flow. What is maximum cross-sectional area?

2- Among all pairs of numbers whose difference is 24, find a pair whose product is as small as possible. What is the minimum product?