After school, Marcus ran 3.2km and Cindy ran 1.95km. Who ran farther? How much farther? I need Help with how I can draw this problem

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

I’m stuck on this equation, anyone got the answer?

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z