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Basile [38]
4 years ago
14

Justin saves $8 every week. Which equation represents the amount of money Justin has,y, after x number of week?

Mathematics
1 answer:
Lorico [155]4 years ago
3 0

If Justin saves $8 every week, and x represents the number of weeks, this can be set up as 8x. We are trying to find the amount of money Justin has after x weeks, so y = 8x.

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You are under contract to design a storage building with a square base and a volume of 14,000 cubic feet. the cost of materials
Goryan [66]
The first thing we are going to do for this case is define variables.
 We have then:
 y = the cost of the box
 x = one side of the square base
 z = height of the box
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 x ^ 2 * z = 14000
 We cleared z:
 z = (14000 / x ^ 2)
 On the other hand, the cost will be:
 floor = 4 (x ^ 2)
 roof = 3 (x ^ 2)
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 1 side = 16 (x * (14000 / x ^ 2)) = 16 (14000 / x)
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 The total cost is:
 y = floor + roof + walls
 y = 4 (x ^ 2) + 3 (x ^ 2) + 896000 / x
 y = 7 (x ^ 2) + 896000 / x
 We derive the function:
 y '= 14x - 896000 / x ^ 2
 We match zero:
 0 = 14x - 896000 / x ^ 2
 We clear x:
 14x = 896000 / x ^ 2
 x ^ 3 = 896000/14
 x = (896000/14) ^ (1/3)
 x = 40
 min cost (y) occurs when x = 40 ft
 Then,
 y = 7 * (40 ^ 2) + 896000/40
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 Then the height
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 roof = 3 * (40 ^ 2) = 4800
 walls = 16 * 4 * (40 * 8.75) = 22400
 Total cost = $ 33600 (as calculated previously)
 Answer:
 
The dimensions for minimum cost are:
 
40 * 40 * 8.75
8 0
4 years ago
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Inga [223]

Step-by-step explanation:

I think option A is the correct answer

Because it is in ascending order

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Answer:

Step-by-step explanation

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