Exam 1: Functions and Change

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Do you expect the average rate of change in the number of smart phones in the U.S. since 2000 to be positive or negative?

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A population is growing according to the formula A population is growing according to the formula   , where P is the population at year t. What is the initial population? , where P is the population at year t. What is the initial population?

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As As   , the function   _____. , the function As   , the function   _____. _____.

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A textbook company had fixed costs of $15,000 and variable costs of $20 for a certain book. The company sells the books for $40 each. What is the break-even point for the company (to the nearest book)?

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Production costs for manufacturing t-shirts consist of a fixed cost of $12,000 plus variable costs of $2 per shirt. Each t-shirt sells for $7 dollars. Find the total profit, Production costs for manufacturing t-shirts consist of a fixed cost of $12,000 plus variable costs of $2 per shirt. Each t-shirt sells for $7 dollars. Find the total profit,   , as a function of the number of shirts produced, q. , as a function of the number of shirts produced, q.

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Which could be a possible formula for the following figure? Assume a and b are positive constants. Which could be a possible formula for the following figure? Assume a and b are positive constants.

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The population of Nicaragua was 3.6 million in 1990 and growing at 3.4% per year. How many years does it take for the population of Nicaragua to increase by 60%? Round to 2 decimal places.

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The solid curve below is a portion of the graph of The solid curve below is a portion of the graph of   and the dashed curve is a portion of the graph of   . The domain of both functions is all real numbers.Which of the following statements are true. Select all that apply.  and the dashed curve is a portion of the graph of The solid curve below is a portion of the graph of   and the dashed curve is a portion of the graph of   . The domain of both functions is all real numbers.Which of the following statements are true. Select all that apply.  . The domain of both functions is all real numbers.Which of the following statements are true. Select all that apply. The solid curve below is a portion of the graph of   and the dashed curve is a portion of the graph of   . The domain of both functions is all real numbers.Which of the following statements are true. Select all that apply.

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In nature, the populations of two animals, one of which preys upon the other (such as foxes and rabbits) are observed to oscillate with time, and are found to be well approximated by trigonometric functions. The population of foxes is shown in the graph below. How many foxes will there be in 15 months? In nature, the populations of two animals, one of which preys upon the other (such as foxes and rabbits) are observed to oscillate with time, and are found to be well approximated by trigonometric functions. The population of foxes is shown in the graph below. How many foxes will there be in 15 months?

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Is the function described by the following table of values exponential? Is the function described by the following table of values exponential?

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Solve Solve   for x using logs. Round to 3 decimal places. for x using logs. Round to 3 decimal places.

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As As   ,   _____. , As   ,   _____. _____.

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Sketch a well-labeled graph of a periodic function such that : -- f(0) = 1,050 -- the period is 12 -- the amplitude is 550. Then write a few sentences illustrating how such a function might apply to a grasshopper population.

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Solve Solve   for both a and k. Round to 3 decimal places. a=_____ k=_____ for both a and k. Round to 3 decimal places. a=_____ k=_____

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The following tables shows values for two functions. Which one could be exponential? The following tables shows values for two functions. Which one could be exponential?    The following tables shows values for two functions. Which one could be exponential?

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A clean up of a polluted lake will remove 4% of the remaining contaminants every year. How many years will it take to reduce the quantity of contaminants to 1/10 of its present level? Round to the nearest tenth.

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A bank pays 6% annual interest. If $1000 is deposited in this bank account, find the amount in the account after 5 years if the interest is compounded weekly.

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As As   , the function   _____. , the function As   , the function   _____. _____.

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The demand and supply curves for a certain product are given in terms of price, p, by The demand and supply curves for a certain product are given in terms of price, p, by   and   . What is the equilibrium price? and The demand and supply curves for a certain product are given in terms of price, p, by   and   . What is the equilibrium price? . What is the equilibrium price?

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The empirical function The empirical function   graphed below represents the population P of a city (in thousands of people) at time t. The _____ of the function is from 1900 to 1980, and the _____ of the function is from approximately 35,000 to 70,000 people.  graphed below represents the population P of a city (in thousands of people) at time t. The _____ of the function is from 1900 to 1980, and the _____ of the function is from approximately 35,000 to 70,000 people. The empirical function   graphed below represents the population P of a city (in thousands of people) at time t. The _____ of the function is from 1900 to 1980, and the _____ of the function is from approximately 35,000 to 70,000 people.

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