
Concept explainers
(a).
To show:
That the concentration
(a).

Explanation of Solution
Given:
A
Concept Used:
From the given information make a table:
Mixture | Concentration | Pure Brine |
Total | Total |
Proof:
The total volume is
So, the concentration is:
Multiply top and bottom by
Hence, it is proved that
(b).
To find:
The domain of the function based on the physical constraints.
(b).

Answer to Problem 83E
The physical domain is
Explanation of Solution
Given:
Calculation:
The physical domain requires the fact that the maximum volume in the tank is
Thus,
So, the physical domain must be
Conclusion:
Hence, the physical domain is
(c).
To graph:
The concentration function also find the rate at which the concentration of brine increases and find the percentage of the concentration of brine appear to approach.
(c).

Explanation of Solution
Given:
As the tank is filled, the slope of the tangent line begins to decrease. Thus, the concentration is stabilizing as
As it fills up the rate of concentration slows considerably as it approaches at
The concentration of brine appear to approach at
Hence, the final concentration of brine appear to approach at
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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