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Marysya12 [62]
3 years ago
5

last year the sales at a bookstore were 75% fiction books, and 25% nonfiction books. The average coss of a fiction book was $15.

The average cost of a nonfiction book was $16. What was the averge costs of all fiction and non-fiction books sold at tthe bookstore last year? enter your answer as a decimal in the box
Mathematics
1 answer:
Tatiana [17]3 years ago
8 0
[75 x 15 + 25 x 16] / (75+25) = 1525/100
=$15.25
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Murrr4er [49]

Answer:

exact value: x= \frac{log25}{4}

approximate: x=0.349485

Step-by-step explanation:

Exact Value:

10^{4x} = 25

log (10^{4x})= log 25

4x = log 25

x= \frac{log25}{4}

Approximate:

x= \frac{log25}{4}

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The answer is 112 centimeters.

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8 0
2 years ago
Use linear approximation to estimate f (2.85 )given that f (3 )equals 2 and f prime (3 )equals 5.
Allisa [31]

Answer:

Step-by-step explanation:

Given that,

f(3) = 2

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The linear approximation of "f" at "a" is one way of writing the equation of the tangent line at "a".

At x = a, y = f(a) and the slope of the tangent line is f'(a).

So, in point slope form, the tangent line has equation

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The linearization solves for y by adding f(a) to both sides

f(x) = f(a) + f'(a)(x − a).

Given that,

f(3) = 2,

f'(3) = 5

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x = 2.85

Therefore,

f(x) = f(a) + f'(a)(x − a)

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5 0
3 years ago
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Ket [755]

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Explanation:

Reason for correct option:

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Since the given expression can be factored further therefore the option d is incorrect.

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4 0
4 years ago
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inna [77]

Answer:

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Step-by-step explanation

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6 0
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