please help i missed this class and i’m a little confused (question is in the pic)please tell me how to solve it

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

Need plz been trying to do it for a long time and still haven’t succeeded

Mia’s gross pay is 2953 her deductions total 724.15 what percent if her gross pay is take-home pay