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Yuki888 [10]
3 years ago
11

A farmer wants to fence an area of 13.5 million square feet in a rectangular field and then divide it in half with a fence paral

lel to one of the sides of the rectangle. What should the lengths of the sides of the rectangular field be so as to minimize the cost of the fence?
Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
3 0
  <span>13.5 = lw 

13.5/l = w 

3l + 2w = C 

C = 3l + 2*(13.5/l) 

C = 3l + (27/l) 

dC(l)/dl = 0 

3 - (27/l^2) = 0 

3*(l^2) - 27 = 0 

(l^2) - 9 = 0 

(l - 3)*(l + 3) = 0 

l = 3 

13.5 = 3w 

l = 3000; w = 4500

Therefore, to minimize the cost of the fence, length should be 3000 ft while width should be 4500 ft.</span>
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Im so lost what the answer is
Rainbow [258]

Answer:

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3\sqrt{41}

\sqrt{41(9)}

\sqrt{369}

Hope this helps!

5 0
2 years ago
Find the complete perimeter of the sector that intercepts arc AC.
zhuklara [117]
To answer, determine first the length of the arc intercepted by the angle which measures 45°. 

Calculate for the circumference of the circle with the equation,
    C = 2πr
where C is circumference and r is radius. Substitute the known value for r,
    C = 2π(7) = 43.98

Then, multiply the obtained value by the ratio of the angle intercepted and the whole revolution. 
    Arc = 43.98 x (45°/360°)
    Arc = 5.5 

The whole perimeter of the sector includes the arc and 2 radii. Hence, the equation for the whole perimeter is,
   Perimeter = Arc + 2r
Substituting the values,
   Perimeter = (5.5) + 2(7)
   Perimeter = 19.50

<em>ANSWER: 19.50 units</em>
7 0
3 years ago
Help me please +brainliest
solmaris [256]

Ok let's start with question 1.

1. The equation is given. If she advices 360 people each week for 4 week she earns...

4(80+360(15)/100) = $536

2. In this problem instead of evaluating M we solve for n with M given.

140=80+15n/100

n=400 people

3. The new equation will still follow the same format.

M=65+21n/100

4. This will be the intersection point of the two lines. So when does...

80+15n/10=65+21n/100

We just have to solve for n.

-0.06n=-15

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6 0
2 years ago
*NEED HELP!!!
miv72 [106K]
A
d
b
d
are the answers
to it

6 0
3 years ago
Read 2 more answers
A train travels 360 km at a uniform speed. If the speed had been 5 km/h less, it would have taken 1 hour more for the same journ
sveticcg [70]

Answer:

45 km/h

Step-by-step explanation:

Speed = x, distance= 360 km

------------

  • 360/x= 360/(x-5)- 1
  • 360/(x-5)-360/x= 1
  • 360x-360(x-5)=x(x-5)
  • x^2-5x=360*5
  • x^2-5x- 1800=0
  • x=45 km/h
6 0
3 years ago
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