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Viktor [21]
3 years ago
15

You have 576 feet of fencing to enclose a rectangular plot of land. Find the dimensions of the rectangular plot that would maxim

ize the area. List the smaller number first.
Mathematics
1 answer:
stiv31 [10]3 years ago
5 0

Answer:

The dimension that maximizes area is 144ft by 144ft

Step-by-step explanation:

Given

P = 576 -- perimeter

Required

The dimension that gives maximum area

Perimeter is calculated as:

P= 2 * (L + W)

So, we have:

2 * (L + W) = 576

Divide through by 2

L + W = 288

Make L the subject

L  = 288 -W

Area is calculated as:

A = L * W

Substitute L  = 288 -W

A = (288 - W) * W

Open bracket

A = 288W - W^2

Differentiate A with respect to W

A' = 288 - 2W

Set to 0 to calculate W

288 - 2W = 0

Collect like terms

2W = 288

Divide by 2

W = 144

Recall that:

L  = 288 -W

L = 288 - 144

L = 144

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Answer:

<h3>55 secs</h3>

Step-by-step explanation:

Given the elevation h (in feet) of the balloon modeled by the function h(x)=−6x+330, we can calculate the time it takes the balloon to reach the ground. The hot air balloon hits the ground at h(x) = 0.

Substitute h(x) = 0 into the modeled expression and find x as shown;

h(x)=−6x+330

0 = −6x+330

6x = 330

Divide both sides by 6

6x/6 = 330/6

x = 55 seconds

Hence the hot air balloon hits the ground after 55 seconds

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Step-by-step explanation:

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