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Review for Retest
Tutoring after school Tuesday. All problems must be
completed. Retest after school Wednesday, Jan 4, 2017.
2:40-3:15
Solve. Rewrite all problems. Show all work. Round answers to 4 decimals.
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13. Find the domain, asymptotes and x intercepts of ln(x+2)-ln(1-x)
14. Find a model for the decay of Finklesteinium, if 31 grams of Finklesteinium has decayed to 12.331
grams after 157.364 years.
15. How long will it take 900 ounces of Finlesteinium to decay to 74 ounces?
16. At three hours there are 15393 bacteria. Seven days later there are 124730199 bacteria,
Find the following:
a) An exponential model for the growth of the bacteria.
b) The starting number, to the nearest tenth, of bacteria.
c) Food is safe to eat as long as bacteria counts remain below 2.5 million. How long, to the nearest
hour did it take for the food to become unsafe?
17. On a college campus of 5000 students, one student returns from vacation with a contagious flu virus.
Five days later 71 students are infected with the virus.
a) Find a model for the spread of the virus.
b) The college will cancel classes after 40% or more of the students are infected. After how many
days will the college cancel classes? Round your answer to the nearest day.
c) Classes will resume when less than 25% of the students are infected. How long will classes be
cancelled? Round your answer to the nearest day.
Find the zeroes, asymptotes, domain range and holes for the functions below.
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