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artcher [175]
4 years ago
5

Tom bought n DVDs for a total cost of 15n - 2 dollars. Which expression represents the cost of each DVD?

Mathematics
1 answer:
Gala2k [10]4 years ago
3 0

A. n ( 15.n - 2 )

eg n = 2

2 ( 15.2 - 2)

2 ( 30 - 2)

2 (18)

36 = 18 + 18

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8 0
3 years ago
A farmer has 1800 m of fencing. He needs to create
NeTakaya

Answer:

67,500 m²

Step-by-step explanation:

ASSUMING the fields look like this __________________

                                                            |                    |                   |

                                                            |                    |                   | W

                                                            |_________|_________|

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Let L be the length of the combined field and W be the width

2L + 3W = 1800

2L = 1800 - 3W

L = 900 - 1.5W

A = LW

A = (900 - 1.5W)W

A = 900W - 1.5W²

Area will be maximized when the derivative equals zero.

dA/dW = 900 - 3W

        0 = 900 - 3W

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L = 900 - 1.5(300)

L = 450 m

A = LW = 450(300) = 135,000 m²

so each sub field is 135000/2 = 67,500 m²

7 0
3 years ago
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