Question 1: Alice, Becky, and Charlie decided to compete in a 225m run. When Alice crossed the finish line, Becky was 15m behind her. When Becky crossed the finish line, Charlie was 15m behind her. How far was Charlie behind Alice when Alice crossed the finish line if all three run at their own constant speed?

question 2:

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