8. Solve to 1 decimal place. 5.3 = 120 9. Sam takes Ibuprofen for her nagging backache. Every hour that the Ibuprofen is in her system, a quarter of the medicine dissolves in her body. (These are made up facts. Always consult your physician or pharmacist before taking medication). This can be modelled by the equation: A = 800(0.75)' a) Complete the following let statements Let A represent Let t represent b) What is the initial dose Sam takes? c) At what rate (%) is Ibuprofen decreasing in the body? d) How much will be in his system after 2hours? e) When there is less than 200mg of medicine left in the body, it is safe to take it again. How long will it take before Sam can take more medicine? (hint: may require trial and error)

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