Of the 15-year-olds at a karate school, 8 have black belts and 14 have brown belts. among the 16-year-olds, 7 have black belts and 12 have brown belts. which age group has a lower ratio of black belts to brown belts? 15-year-olds 16-year-olds neither; the ratios are equivalent submit

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