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Whitepunk [10]
3 years ago
14

A landscape architect plans to enclose a 3000 square feet rectangular region in a botanical garden. She will use shrubs costing

25 dollar per foot along three sides and fencing costing 15 dollars per foot along the fourth side. Find the dimensions of the botanical garden that will minimize the total cost. Follow the steps:
Mathematics
1 answer:
Ainat [17]3 years ago
6 0

Answer:

20L + 15L + 15(2W) = Cost = C

LW = 3000

W=3000/L

35L + 30(3,000/L) = C

C(L) = 35L + 90,000L^-1

take the derivative of C(L) and set equal to zero, solve for L

C' = 35 - 90000L^-2 = 0

35=90,000/L^2

L^2 = 90,000/35

L= 300/sqr35 = 300sqr35/35= about 50.71 feet of fencing one 1 side and of shrubs on the opposite side

W =3000/300/sqr35 = 10sqr35=59.16 feet of shrubs on 2 sides

W=59.2

L=50.7

WL = square feet

but rounding to one decimal gives WL=3001 square feet

at cost of 30(59.2) + 15(50.7) + 20(50.7)

= 1776 + 1774.5 = $3550.50

but 30(60)+35(50)=1800+1750= $3550.00, 50 cents less

and 60x50=3000 square feet

30(59.16)+35(50.71) = 1774.8 + 1774.85 = $3549.65 the minimum cost with 59.16 by 50.71 feet

rounding errors make a few cents difference

more exact dimensions are 59.16079783 by 50.70925528 feet for minimum cost

for calculus on the absolute minimum, take the 2nd derivative

or look at the end points

60x50 feet is virtually the cost minimizing dimensions.

look at some other simple numbers on either side and you'll find higher cost.  It's

a local minimum, but the endpoints show it's also an absolute minimum

Step-by-step explanation:

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Jerry plays tennis once every 6 days.Sam plays tennis every 10 days and Leo comes once every 12 days.Thus Monday all of them pla
drek231 [11]

Answer:

Friday

Step-by-step explanation:

Given

Jerry = Every 6 days.

Sam = Every 10 days

Leo = Every 12 days.

Required.

If they meet on Monday, when next (day) will they meet

First, we need to get the multiple of 6, 10 and 12.

6 => 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72......

10 => 10, 20, 30, 40, 50, 60, 70, 80.....

12=> 12, 24, 36, 48, 6o, 72, 84, 96......

The common factor between the multiples of 6, 10 and 12 is 60.

This represents the LCM.

It implies that they'll meet on the 60th day after their last meeting on Monday.

To get the day, follow the steps below.

Since there are 7 days a week

So, there are 60/7 weeks in 60 days

60/7 = 8 weeks 4 days

Recall that the last day they met was a Monday.

Hence, there next meeting will be 4 days after Monday.

4 days after Monday = Friday

7 0
3 years ago
You are constructing triangle ABC given the line segments AB and AC and ∠A. The first thing you do is copy segment AC. Next, you
kondaur [170]

Answer:

  C)  Copy AB

Step-by-step explanation:

The general idea is that you copy one segment, then the angle (so you know which direction the other segment goes), then the second segment. Finally, you connect the ends of the segments to complete the triangle.

The given description says you've done the first two parts of this, so you must mark off the length of segment AB in the direction you just constructed. That is, you must ...

  Copy AB.

_____

In the attached figure, the construction did segment AB first, and is about to do segment AC next. The idea is the same. Swap points B and C in your mind to match the description in the problem statement.

7 0
3 years ago
can someone j help me w this, ive reposted it twice now :-(((( due in an hour please help!:( will give brainliest
Doss [256]

Step-by-step explanation:

I got you,

a) Work...

First equation: y = 4x + 3

Second equation: y = 2x + 11

If he wants to play 2 games...

y = 4 (2) + 3

y = 11

y = 2 (2) + 11

y = 15

<u>Answer for part a: If a customer wants to rent shoes and play two games, they'll pay more with the new price plan. With the current price plan, they'll pay 11 dollars, but with the new price plan, they'll pay 15 dollars.</u>

b) Work...

seven games...

y = 4 (7) + 3

y = 31

y = 2 (7) + 11

y = 25

<u>Answer for part b: If the customer wants to play 7 games, including the shoes, they would pay less using the new plan. If the shes were not included, the new price will still be less. With the shoes, 7 games, with the original plan, is 31 dollars but 25 dollars with the new plan. If they didn't want to rent shoes, they would pay 28 dollars with the original plan but only 14 dollars with the new plan. All in all, they spend less on the new plan anyways.</u>

I hope this helps :)

7 0
3 years ago
Read 2 more answers
Find the midpoint of the segment whose endpoints are (-6,-8) and (3,6) show your work!
pogonyaev

Answer:

-1.5, -1

Step-by-step explanation:

midpoint formula

(x1 + x2 / 2) , (y1 + y2/ 2)

-6 + 3 / 2 ,   -8  + 6 / 2

3 0
2 years ago
Read 2 more answers
A cricket team won 60% of the total matches it played during the year. If it lost 24 matches in all and no matches were drawn, f
posledela

it lost 100 - 60 = 40% of its games ( = 0.40)

Total games played = 24 / 0.40 = 60 answer

7 0
3 years ago
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