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yrivers36
 4 years ago
a rain gutter is being fabricated from a flat sheet of metal so that the cross section of the gutter is a rectangle. The width of the metal is 12 inches.
a. write a formula f(x) that gives the area of the cross section.
b. to hold the greatest amount of rainwater, the cross section should have a maximum area. Find the dimensions that would result in this maximum.
yrivers36
 4 years ago
a rain gutter is being fabricated from a flat sheet of metal so that the cross section of the gutter is a rectangle. The width of the metal is 12 inches. a. write a formula f(x) that gives the area of the cross section. b. to hold the greatest amount of rainwater, the cross section should have a maximum area. Find the dimensions that would result in this maximum.

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0a) short side of rectangle = x long side = (122x)/2 = 6x So f(x) =x(6x)

Yrivers36
 4 years ago
Best ResponseYou've already chosen the best response.0thank you...its just x(122x)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0b) To find maximum you have to see where the derivative gets 0.\[f'(x) = 2x +6\] it will be 0 for x=3 So that's your answer: short side x=3, long side (122x)/2=6x = 63 =3 So it's a square

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0what is this (122x)/2 ?? The perimeter of rectangle is 12. So if short side length is x, rest this amount twice (since there are two equal sides ) from 12 and the rwhat's left is the sum of the 2 long sides (that's why devide by 2)
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