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Average Rate of Change of a Function In Exercises 61-64, find the average rate of change of the function from
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- Fill in the blanks: The derivative of a product of two functions is the first function times the of the second plus the second function times the derivative of the first. ( Previous Continue >arrow_forwardX+200p=10,000 X>0 P>0 express the revenue (price times units sold), R, as a function of p. R=arrow_forwardPls help ASAParrow_forward
- In retail sales, an important marker of retail activity is the stock turnover at retail. This figure is calculated for a specific period of time as the total net sales divided by the retail value of the average stock during that time, where both are measured in dollars. As a formula, this is expressed as follows. Net sales Stock turnover = Average stock at retail This formula expresses stock turnover as a function of net sales and average stock at retail. (a) Suppose that your store had net sales of $681,000 in men's shoes over the past six months and that the retail value of the average stock of men's shoes was $124,000. What was the stock turnover at retail for that time period? (Round your answer to two decimal places.) (b) Suppose that in a certain month your store's net sales of women's dresses were $88,000 and that the usual stock turnover at retail is 0.5 per month. What do you estimate to be your store's average stock at retail? (Round your answer to the nearest dollar.) $ (c)…arrow_forwardA mixing vat initially contains 253 gallons of chemical A and 200 gallons of chemical B, mixed together. Inlet pumps are turned on at 7:00 a.m. (time t = 0) that pump in 3.7 gallons of chemical A each hour and 10.2 gallons of chemical B each hour, creating a constantly changing mix of the two chemicals over time. a. Write a function A(t) that gives the ratio of chemical A to chemical B after t hours of pumping. A(t) b. How many hours will it take for the ratio of chemical A to chemical B in the vat to reach 0.558? hours Round to three decimal places. c. Over a "long time," what value will the ratio of the amount of chemical A to the amount of chemical B get closer and closer to, if this mixing process is allowed to continue indefinitely? Round to three decimal places.arrow_forwardFreight on Class I Railroads According to the Association of American Railroads, Class I freight railroads are the line-haul freight railroads with 2006 operating revenue in excess of 346.8million. Let F=F(t) denote the freight revenue in billions of dollars of Class I railroads in year t. In 2005, Class I railroads had a freight revenue of 44.5billion. In 2007, the revenue was 52.9 billion. Calculate the average rate of change per year in F from 2005 to 2007 and explain its meaning in practical terms.arrow_forward
- The number of people afflicted with the common cold in the winter months dropped steadily by 50 each yearsince 2004 until 2010. In 2004, 875 people were inflicted. Find the linear function that models the number of people afflicted with the common cold C as a function of theyear, t. When will no one be afflicted?arrow_forwardaThe average rate of change of a function f between x=a and x=b is the slope of the ___________ line between (a,f(a)) and (b,f(b)).arrow_forwardCeramics When the temperature of a pot in a kiln is 1200, an artist turns off the heat and leaves the pot to cool at a controlled rate of 18 per hour. Express the temperature of the pot in degrees Celsius as a function of the time t in hours since the kiln was turned off.arrow_forward
- Falling with a parachute If an average-sized man jumps from an airplane with an open parachute, his downward velocity t seconds into the fall is v(t)=20(10.2t) Feet per second. a. Use functional notation to express the velocity 2 seconds into the fall, and then calculate it. b. Explain how the velocity increases with time. Include in your explanation the average rate of change from the beginning of the fall to the end of the first second and the average rate of change from the fifth second to the sixth second of the fall. c. Find the terminal velocity. d. Compare the time it takes to reach 99 of terminal velocity here with the time it took to reach 99 of terminal velocity in Example 2.1. On the basis of the information we have, which would you expect to reach 99 of terminal velocity first, a feather or a cannonball?arrow_forwardLet f be a function with constant rate of change. Then a f is a ________ function and f is of the form fx = ______x ________. b The graph of f is a __________.arrow_forwardHigh School Graduates The following table shows the number, in millions, graduating from high school in the United States in the given year. Year Number graduating in millions 1985 2.83 1987 2.65 1989 2.47 1991 2.29 a. By calculating difference, show that these data can be modeled using a linear function. b. What is the slope for the linear function modeling high school graduations? Explain in practical terms the meaning of the slope. c. Find a formula for a linear function that models these data. d. Express, using functional notation, the number graduating from high school in 1994, and then use your formula from part c to calculate that value.arrow_forward
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