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3 years ago

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The perimeter of a parallelogram is 62cm. what is the length of the longest side if the equation of the sides are:-

1 answer:

sleet_krkn [62]3 years ago

7 0

Given

perimeter is 62

Side 1 - 3x+5

Side 2 - x+2

Solution,

2(3x+5+x+2) = 62

4x+7 = 31

4X = 24

x = 6

Now substitute the value of x to get the sides

Side one - 3x+5 = 23cm

Side two - x+2 = 8cm

Answer- the length of the longest side is 23 cm

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Answer:

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Step-by-step explanation:

GIVEN: A fence is to be built to enclose a rectangular area of $240$ square feet. The fence along three sides is to be made of material that costs $6$ dollars per foot, and the material for the fourth side costs $12$ dollars per foot.

TO FIND: Find the dimensions of the enclosure that is most economical to construct.

SOLUTION:

Area of rectangular fence $=240\text{ sq. ft}$

let the length of fence $=x$

let the width of fence $=y$

let $x$ be the smaller side

Area of rectangular fence enclosure $=xy$

$xy=240$

$y=\frac{240}{x}$

cost of fence along three sides $=6 \text{ dollars per feet}$

cost of fence along fourth side $=12 \text{ dollars per feet}$

length of fence $=2x+2y$

cost of fence building $=6(2x+y)+12y$

$=12x+18y$

putting value of $y$

$=12x+18\times\frac{240}{x}$

$=12x+4320x^{-1}$

to find minimum value differentiating the equation

$12-\frac{4320}{x^{2} }=0$

$x^{2} =\frac{4320}{12}$

$x^{2} =360$

$x=18.97\text{ft}$

$y=12.65\text{ft}$

Hence the dimensions of the enclosure that is most economical to construct are $18.97\text{ft}$ and $12.65\text{ft}$

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