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galben [10]
3 years ago
8

A laptop computer is purchased for 3100. Each year, its value is 75% of its value the year before. After how many years will the

laptop computer be worth $600 or less
Mathematics
2 answers:
Dmitriy789 [7]3 years ago
8 0

Answer:

6 years

Step-by-step explanation:

Y = IA (r)^t

600 = 3100 (.75)^t

then just solve for T i recommend using guess and check, but thats me

and youll get 6 years.

Stella [2.4K]3 years ago
6 0

Answer:7 to 9? Years

Step-by-step explanation: I’m not sure but if you got a couple trys try to do it.

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Answer:

CI = (70.861 , 94.418)

Step-by-step explanation:

In order to determine the 90% confidence interval you use the following formula (for a population approximately normal):

CI=(\overline{x}-Z_{\alpha/2}\frac{\sigma}{\sqrt{n}},\overline{x}+Z_{\alpha/2}\frac{\sigma}{\sqrt{n}})    (1)

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Z_α/2 = Z_0.05: Z factor =  1.645

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The confidence interval will be:

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The 90% confidence interval is (70.861 , 94.418)

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3 years ago
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Step-by-step explanation:

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