Mathematics, 25.01.2020 03:31 marifermolina

Suppose that the number of worker-hours required to distribute new telephone books to x% of the households in a certain rural community is given by the function w(x)=250x/(400−x). (a) what is the domain of the function w? (give the domain in interval notation. if the answer includes more than one interval write the intervals separated by the "union" symbol, u.) (b) for what values of x does w(x) have a practical interpretation in this context? (c) how many worker-hours were required to distribute new telephone books to the first 70% of the households? (d) how many worker-hours were required to distribute new telephone books to the entire community? (e) what percentage of the households in the community had received new telephone books by the time 3 worker-hours had been expended?

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Answer from: cyndalulu6729

a) The domain of the function is $\mathbb{R}-\{400\}$ .

b) The subset of the domain that have a practical interpretation is [0, 100] .

c) 53.030 worker-hours are required to distribute new telephone books to the first 70 % of the households.

d) 83.333 worker-hours are required to distribute new telephone books to 100 % of the households.

e) 4.743 % have received the new telephone books by the time 3 worker-hours had been expended.

Procedure - Functional analysis on an expression for the number of worker-hours to distribute new telephone books in a rural communitya) Determination of the domain of the function

Mathematically speaking, the domain of the function is the set of values of such that a value of exists. In the case of rational functions, the domain is all real numbers except for all values of such that the denominator becomes zero.

The value of such that rational function become undefined is:

400 - x = 0

x = 400

Hence, the domain of the function is $\mathbb{R}-\{400\}$ . $\blacksquare$

b) Determination of context-based domain

Percentages are positive real numbers between 0 and 100. Hence, the subset of the domain that have a practical interpretation is [0, 100] . $\blacksquare$

c) Determination of required worker-hours (I)

If we know that $W(x) = \frac{250\cdot x}{400-x}$ and x = 70 , then we have that the required worker-hours are:

$W(70) = \frac{250\cdot (70)}{400-70}$

W(70) = 53.030

53.030 worker-hours are required to distribute new telephone books to the first 70 % of the households. $\blacksquare$

d) Determination of required worker-hours (II)

If we know that $W(x) = \frac{250\cdot x}{400-x}$ and x = 100 , then we have that the required worker-hours are:

$W(100) = \frac{250\cdot (100)}{400-100}$

W(100) = 83.333

83.333 worker-hours are required to distribute new telephone books to 100 % of the households. $\blacksquare$

e) Determination of percentage of the household that receive the telephone books

If we know that $W(x) = \frac{250\cdot x}{400-x}$ and W(x) = 3 , then we have that the percentage of the households that received the new telephone books are:

$3 = \frac{250\cdot x}{400-x}$

$1200-3\cdot x = 250\cdot x$

$253\cdot x = 1200$

x = 4.743

4.743 % have received the new telephone books by the time 3 worker-hours had been expended. $\blacksquare$

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Suppose that the number of worker-hours required to distribute new telephone books to x% of the hous...