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torisob [31]
3 years ago
13

Lee walked a total of 4.48 miles. he walks 1.4 miles each hour. how long did lee walk?​

Mathematics
2 answers:
nadya68 [22]3 years ago
7 0

Answer:

3.2 hrs

Step-by-step explanation:

Recall that distance = rate times time, so:

4.48 mi = (1.4 mph)(time), and:

                                          4.48 mi

the elapsed time was ------------------- = 3.2 hours

                                       1.4 mph

laila [671]3 years ago
4 0

Answer - 3.2 hours

because 4.48 miles divided by 1.4 mph equals 3.2

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A fence must be built to enclose a rectangular area of 20,000 ft^2. Fencing material costs $4 per foot for the two sides facing
Marysya12 [62]

The cost of the least expensive fence is $3200

Step-by-step explanation:

The given is:

  • A fence must be built to enclose a rectangular area of 20,000 ft²
  • Fencing material costs $4 per foot for the two sides facing north and south and ​$8 per foot for the other two sides

We need to find the cost of the least expensive fence

Assume that the length of each side opposite to North or South is x feet and the length of each other sides  is y feet

∵ The length of the rectangle = x feet

∵ The width of the rectangle = y feet

∵ The rectangular area is 20,000 ft²

- Area of a rectangle = length × width

∴ x × y = 20,000

- Divide both sides by x to find y in terms of x

∴ y=\frac{20,000}{x}

The fence's length is equal to the perimeter of the rectangular area

∵ Perimeter of the rectangle = 2 length + 2 width

∴ Perimeter of the rectangle = 2x + 2y

∵ Fencing material costs $4 per foot for the two sides facing

   North and South

∴ x costs $4 per foot

∵ The cost of the other two sides is $8 per foot

∴ y costs $8 per feet

The cost of the fence is the sum of the products of 4 , 2x and 8 , 2y

∵ The cost of the fence (C) = 4(2x) + 8(2y)

∴ C = 8x + 16y

- Substitute y by its value above

∴ C=8x+16(\frac{20,000}{x})

∴ C=8x+\frac{320,000}{x}

To find the least expensive differentiate C with respect to x and equate the answer by 0 to find the value of x

∵ \frac{320,000}{x} can be written as 320,000x^{-1}

∴ C=8x+320,000x^{-1}

∵ \frac{dC}{dx}=8(1)x^{1-1}+320,000(-1)x^{-1-1}

∴ \frac{dC}{dx}=8-320,000x^{-2}

- Equate \frac{dC}{dx} by zero

∴ 8-320,000x^{-2}=0

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∴ 8-\frac{320,000}{x^{2}}=0

- Subtract 8 from both sides

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∴ - 320,000 = - 8x²

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∴ 40,000 = x²

- Take √  for both sides

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Learn more:

You can learn more about the differentiation in brainly.com/question/4279146

#LearnwithBrainly

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Answer:

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