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Supplemental Problems for Section 2.2
Example 1: For what values of x does the graph of [pic]
have a horizontal tangent?
Solution:
Example 2: The position of a cat running from a dog down a dark alley is given by the values of the table.
t (seconds) |0 |1 |2 |3 |4 |5 | |s (feet) |0 |14 |22 |78 |90 |114 | |
a. Find the average velocity of the cat (ft/sec) for the time period beginning when t=2 and lasting
i) 3 s
ii) 2 s
iii) 1 s
b. Draw the graph of the function for yourself and estimate the instantaneous velocity of the cat (ft/sec) when t = 2.
Solution:
Example 3: The population of a slowly growing bacterial colony after t hours is given by [pic]. Find the growth rate after 2 hours.
Solution:
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Fact: Given the cost [pic] of producing x units of product, the marginal cost is defined to be the rate of change of cost (the approximate increase in cost when production is increase by 1 unit).
Example 4: The cost of producing x units of stuffed alligator toys is [pic]. Find the marginal cost at the production level of 1000 units.
Solution:
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