9. What is the amount of radioactive material remaining after 9 days in a radioactive sample with decay rate n = 25 (9) ²/2 modelled by the equation y = 25 a. 0.11 mg b. 0.19 mg 10. The simplified form of (az) (a³) i is: (aio) a. b. (az) C. 1.1 mg d. 2.2 mg C. (as) d. (a¹)

F. 2.5(JK) 12 What is HL? = 7H %3D

10. A =bh A' =bh or ans : %3D (h) 4h

Use the table to the right answer the following question. Item Energy released by burning 1 kg of a certain combustible sedimentary rock Energy (joules) 1.6x 10" How many kilograms of isotope would be required to supply the energy needs of country B for 1 year? Energy released by fission of 1 kg of a certain isotope Energy released by fusion of hydrogen in 1 liter of water Country A annual energy consumption Country B annual energy consumption 5.6x 1013 7x 10 2x 101 3x 10 It would take approximately kilograms. (Use scientific notation. Use the multiplication symbol in the math palette as needed. Round three decimal places as needed.)

Q1. Qingshan runs at an average rate of 5.9 mph for 2.7 hours every morning. If he burns 43.5 kJ/min, how many calories does he burn each day? Q2. Baby Mirella has yet another earache, and the doctor has prescribed of 4.7 mg of an antibiotic to help clear the infection. If the suspension from the pharmacy is 511 mcg/5mL how many tsp of the suspension are needed?

10.) Let N represent a mass of carbon 14 (in grams), whose half-life is 5720 years. The quantity of carbon 14 present after t years is N = 10 (2)/5720 a) Determine the initial quantity (when t = 0). b) Determine the quantity present after 2000 years. (Round to the nearest thousandth.)

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H 14. If mZSTU = (5x- 16) and mSU = (12x-50)', find mZSTU. %3D U T. DELL Ce %24 % d. f

8. When a person takes a drug, one can measure the number of milligrams of the drug in a person's system after t hours. This amount is given by D(t) = A.Bt a. Assume that a person takes 20 milligrams at the beginning. Determine A. b. Assume that the number of milligrams decreases by 20% every hour. Determine B. c. Now assume that instead, the number of milligrams decreases by 20% every 2 hours. Determine B. For another drug, the number of milligrams in a person's system after t hours is given by the equation D(t)=100-2-0.5 d. When will the number of milligrams be half of the initial amount? e. After how many hours will the drug have disappeared completely, according to this model?