The cross section of a drain is a trapezoid, as shown in the figure. The sides and the bottom of the trapezoid are each ?a = 9 ft long. Determine the angle  so that the drain will have a maximal cross-sectional area.

?

?
__________°

Fill in the blank(s) with the appropriate word(s).


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Mathematics

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A.

B.

C.

D.

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B. y = mx + 
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Add.9900 square meters + 400 square meters + 77 square meters

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Find approximate x-intercepts. Round the coordinates to the nearest tenth if necessary.y = 2x2 + 5x + 3

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Mathematics