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In Silicon Valley, a number of computer firms were found to be contaminating underground water supplies with toxic chemicals stored in leaking underground containers. A water quality control agency ordered the companies to take immediate corrective action and contribute to a monetary pool for the testing and cleanup of the underground contamination. Suppose that the required monetary pool (in millions of dollars) is given by the following function, where x is the percentage (expressed as a decimal fraction) of the total contaminant removed. Complete parts (A) through (E). P(x) = 7x / (1 - x) 0 ≤ x < 1

          In Silicon Valley, a number of computer firms were found to be contaminating underground water supplies with toxic chemicals stored in leaking underground containers. A water quality control agency ordered the companies to take immediate corrective action and contribute to a monetary pool for the testing and cleanup of the underground contamination. Suppose that the required monetary pool (in millions of dollars) is given by the following function, where x is the percentage (expressed as a decimal fraction) of the total contaminant removed. Complete parts (A) through (E).
P(x) = 7x / (1 - x)
0 ≤ x < 1
        
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Principles of Economics
Principles of Economics
Gregory Mankiw 8th Edition
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In Silicon Valley, a number of computer firms were found to be contaminating underground water supplies with toxic chemicals stored in leaking underground containers. A water quality control agency ordered the companies to take immediate corrective action and contribute to a monetary pool for the testing and cleanup of the underground contamination. Suppose that the required monetary pool (in millions of dollars) is given by the following function, where x is the percentage (expressed as a decimal fraction) of the total contaminant removed. Complete parts (A) through (E). P(x) = 7x / (1 - x) 0 ≤ x < 1
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In Silicon Valley, a number of computer-related manufacturing firms were contaminating underground water supplies with toxic chemicals stored in leaking underground containers. A water quality control agency ordered the companies to take immediate corrective action and contribute to a monetary pool for the testing and cleanup of the underground contamination. Suppose that the monetary pool (in millions of dollars) for the testing and cleanup is given by $$P(x)=\frac{2 x}{1-x} \quad 0 \leq x<1$$ where $x$ is the percentage (expressed as a decimal) of the total contaminant removed. (A) How much must be in the pool to remove $90 \%$ of the contaminant? (B) How much must be in the pool to remove $95 \%$ of the contaminant? (C) Find $\lim _{\text {limit. }} x \rightarrow 1^{-} P(x)$ and discuss the implications of this limit.

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In Silicon Valley, a number of computer-related manufacturing firms were contaminating underground water supplies with toxic chemicals stored in leaking underground containers. A water quality control agency ordered the companies to take immediate corrective action and contribute to a monetary pool for the testing and cleanup of the underground contamination. Suppose that the monetary pool (in millions of dollars) for the testing and cleanup is given by $$ P(x)=\frac{2 x}{1-x} \quad 0 \leq x<1 $$ where $x$ is the percentage (expressed as a decimal) of the total contaminant removed. (A) How much must be in the pool to remove $90 \%$ of the contaminant? (B) How much must be in the pool to remove $95 \%$ of the contaminant? (C) Find $\lim _{-1} P(x)$ and discuss the implications of this limit. $\lim _{x \rightarrow 1^{-}} P(x)$

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In Silicon Valley, a number of computer-related manufacturing firms were contaminating underground water supplies with toxic chemicals stored in leaking underground containers. A water quality control agency ordered the companies to take immediate corrective action and contribute to a monetary pool for the testing and cleanup of the underground contamination. Suppose that the monetary pool (in millions of dollars) for the testing and cleanup is given by $$P(x)=\frac{2 x}{1-x} \quad 0 \leq x<1$$ where $x$ is the percentage (expressed as a decimal) of the total contaminant removed. (A) How much must be in the pool to remove $90 \%$ of the contaminant? (B) How much must be in the pool to remove $95 \%$ of the contaminant? (C) Find $\lim _{\text {limit. }} x \rightarrow 1^{-} P(x)$ and discuss the implications of this limit.

Eleni K.


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Transcript

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00:01 The mandatory pore is a function of the percentage of total contaminant removed.
00:10 For part a, we just need to evaluate the function value at 0 .9.
00:17 So we just substitute x with 0 .9 into the function, which equals 18.
00:29 For part b, we just need to evaluate the function at 0 .95...
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