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18. The exponential function fx)-25,000()5i is a model for the population of a community x years after 1990. Predict the population for 2030. Round to the nearest whole number. 19. Use A-P(1 +r to find the amount accrued if $15,000 is invested for one year at 4% compounded quarterly. Round to the nearest cent. 20. A substance undergoes radioactive decay at a rate of 0.7% per day. For a mass of 1 kilogram of the substance, the formula y (2.7) 0007 indicates how many kilograms of the undecayed radioactive substance will remain after r years. How many kilograms of radioactive material remain after 40 days? Round to the nearest thousandth of a kilogram. CRIBD 2 ofs Q a
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18. The exponential function fx)-25,000(2)0 05t is a model for the population of a community x years after 1990. Predict the population for 2030. Round to the nearest whole number 2 19. Use A-P( 1 +r | to find the amount accrued if $15,000 is invested for one year at 4% compounded Round to the nearest cent.

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