Chapter 5: Q. 86 (page 270)
A function has an inverse function. If the graph of lies in quadrant II, in which quadrant does the graph of lie?
Short Answer
The graph of lies in the quadrant
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Chapter 5: Q. 86 (page 270)
A function has an inverse function. If the graph of lies in quadrant II, in which quadrant does the graph of lie?
The graph of lies in the quadrant
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A 50-mg sample of a radioactive substance decays to 34 mg after 30 days. How long will it take for there to be 2 mg remaining?
Bacterial Growth
A culture of bacteria obeys the law of uninhibited growth.
(a) If N is the number of bacteria in the culture and t is the time in hours, express N as a function of t.
(b) If 500 bacteria are present initially and there are 800 after 1 hour, how many will be present in the culture after 5 hours?
(c) How long is it until there are 20,000 bacteria?
A function is decreasing on the intervalWhat conclusions can you draw about the graph of?
Foreign ExchangeTraders often buy foreign currency in hope of making money when the currency’s value changes.
For example, on March 22, 2011, one U.S. dollar could purchase 0.7045 Euros, and one Euro could purchase 114.9278 yen. Let represent the number of Euros you can buy with dollars, and let represent the number of yen you can buy with Euros.
(a) Find a function that relates dollars to Euros.
(b) Find a function that relates Euros to yen.
(c) Use the results of parts (a) and (b) to find a function that relates dollars to yen. That is, find
(d) What is ? Interpret this result.
The hotel Bora-Bora is having a pig roast. At noon, the chef put the pig in a large earthen oven. The pig’s original temperature was 75°F. At 2:00 pm the chef checked the pig’s temperature and was upset because it had reached only 100°F. If the oven’s temperature remains a constant 325°F, at what time may the hotel serve its guests, assuming that pork is done when it reaches 175°F?
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