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seventeen is eight more than a numberFive times the sum of a number and 17 is at least-15.3 years from now david's age will be 3 times his age 12 years ago. How old was david 12years agoSerenity is going to invest in an account paying an interest rate of 4.4% compounded continuously. How much would Serenity need to invest, to the nearest hundred dollars, for the value of the account to reach 670 in 11 years?One box of cereal contains 12% more cereal than another box. The larger box contains 3 more ounces of cereal than the smaller box. How much does the cereal in each box weigh?