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- consider data from the Statistical Abstract of the United States on the fraction of women married for the first time in 1960 whose marriage reached a given anniversary number. The data show that the fraction of women who reached their fifth anniversary was 0.928. After that, for each one-year increase in the anniversary number, the fraction reaching that number drops by about 2%. These data describe constant percentage change, so it is reasonable to model the fraction M as an exponential function of the number n of anniversaries since the fifth.A shirt factory has just installed a boiler that will last for 35 years. It is expected that there will be no maintenance expenses until the end of the 11th year when P 4,000 is spent for maintenance and will continue in the succeeding years until the boiler is scrapped at the end of 35 years. What sum of money is set aside now at 6% compounded continuously will take care of all the maintenance of the boiler?Suppose that P0 is invested in a savings account in which interest is compounded continuously at 5.8% per year. That is, the balance P grows at the rate given by dPdt=0.058P. Suppose that $7000 is invested. When will the investment double?
- Suppose that fis an exponential function with decay factor 0.094 and that f(0) = 400. Find f(2). (Round your answer to three decimal places. Find a formula for f(x).A colony of bacteria is grown under ideal conditions in a laboratory so that the population increases exponentially with time. After 9 minutes there are 1,000 bacteria and after 15 minutes there are 3,000. How many are there after 33 minutes? Do NOT approximate any values.A CERTAIN RADIOACTIVE MATERIAL IS KNOWN TO DECAY AT A RATE PROPORTIONAL TO THE AMOUNT PRESENT. IF AFTER ONE HOUR IT IS OBSERVED THAT 10% OF THE MATERIAL HA DECAYED, FIND (a) AN EXPRESSION OF THE MATERIAL REMAINING AT ANY TIME (b) FIND THE HALF-LIFE MATERIAL.
- A 0.3 ml dose of a drug is injected into a patient steadily for 0.65 seconds. At the end of this time, the quantity, Q, of the drug in the body starts to decay exponentially at a continuous rate of 0.2% per second. Using formulas, express Q as a continuous function of time, t, in seconds. Q(t)= if 0≤t≤ and Q(t)= if ≤t≤∞Find the missing values assuming continuously compounded interest.Suppose you deposit 3 000 at a 6% interest compounded continuously. What will the Average value of your account during the first 3 years be?
- a certain strain of bacteria is placed in a petri dish as a part of an experiment. The number of bacteria present in the petri dish, b(t), grows exponentially as a function of t, where t is measured in minutes since the start of the experiment. However, the lab assistant carelessly forgot to measure the number of bacteria at the start of the experiment. If there are 600 bacteria present after 1 minute and 900 bacteria present after 3 minutes, model the number of bacteria b(t) as an exponential function of tWhen a breeding group of animals is introduced into a restricted area such as a wildlife reserve, the population can be expected to grow rapidly at first but to level out when the population grows to near the maximum that the environment can support. Such growth is known as logistic population growth, and ecologists sometimes use a formula to describe it. The number N of deer present at time t (measured in years since the herd was introduced) on a certain wildlife reserve has been determined by ecologists to be given by the function below. (Round your answers down to the nearest whole number.) N = 12.35 0.01 + 0.54t (a) How many deer were initially on the reserve? deer(b) Calculate N(12).N(12) = deer (c) Express the number of deer present after 17 years using functional notation. N Calculate the number of deer present after 17 years. deer(d) How much increase in the deer population do you expect from the 12th to the 17th year? deerWhen a breeding group of animals is introduced into a restricted area such as a wildlife reserve, the population can be expected to grow rapidly at first but to level out when the population grows to near the maximum that the environment can support. Such growth is known as logistic population growth, and ecologists sometimes use a formula to describe it. The number N of deer present at time t (measured in years since the herd was introduced) on a certain wildlife reserve has been determined by ecologists to be given by the function below. (Round your answers down to the nearest whole number.) N = 12.33 0.01 + 0.54t (a) How many deer were initially on the reserve? deer(b) Calculate N(12).N(12) = deer(c) Express the number of deer present after 17 years using functional notation. N Calculate the number of deer present after 17 years. deer(d) How much increase in the deer population do you expect from the 12th to the 17th year? deer