An envelope is 5 inches wide, and it measures 9 inches along the diagonal. How tall is the envelope? If necessary, round to the nearest tenth.

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The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.