When he was 40 keefer began investing $150 per month in various securities for his retirement savings. his investments averaged a 4.5% annual rate of return until he retired at age 70. what was the value of keefer's retirement savings when he retired? assume monthly compounding of interest.

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered