12. The half-life of silicon-32 is /10 years. If 70 grams is present now, how much will be present in 400 years? c. 67.319 b. 1.41 а. 0 d. 47.37

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Chapter4: Exponential And Logarithmic Functions
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Problem 12CC: Suppose that the initial size of a population is n0 and the population grows exponentially. Let n(t)...
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12. The half-life of silicon-32 is 710 years. If 70 grams is present now, how much will be present in 400 years?
c. 67.319
13. The growth in the population of a certain rodent at a dump site fits the exponential function A(t) = 458e 0.029t , where t is the
a. 0
b. 1.41
d. 47.37
number of years since 1978. Estimate the population in the year 2000.
b. 892
a. 434
c. 471
d. 867
14. The function D(h) = 5e -0.4h can be used to determine the milligrams D of a certain drug in a patient's bloodstream h hours
after the drug has been given. How many milligrams (to two decimals) will be present after 7 hours?
b. 0.3 mg
c. 82.22 mg
a.3.63 mg
d. 0.95 mg
15. The rabbit population in a forest area grows at the rate of 4% monthly. If there are 260 rabbits in July, find how many rabbits
(rounded to the nearest whole number) should be expected by next July. Use y = 260(2.7)0.04t
a. 337
b. 406
C. 432
d. 419
Transcribed Image Text:12. The half-life of silicon-32 is 710 years. If 70 grams is present now, how much will be present in 400 years? c. 67.319 13. The growth in the population of a certain rodent at a dump site fits the exponential function A(t) = 458e 0.029t , where t is the a. 0 b. 1.41 d. 47.37 number of years since 1978. Estimate the population in the year 2000. b. 892 a. 434 c. 471 d. 867 14. The function D(h) = 5e -0.4h can be used to determine the milligrams D of a certain drug in a patient's bloodstream h hours after the drug has been given. How many milligrams (to two decimals) will be present after 7 hours? b. 0.3 mg c. 82.22 mg a.3.63 mg d. 0.95 mg 15. The rabbit population in a forest area grows at the rate of 4% monthly. If there are 260 rabbits in July, find how many rabbits (rounded to the nearest whole number) should be expected by next July. Use y = 260(2.7)0.04t a. 337 b. 406 C. 432 d. 419
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