A couple of your friends have asked your help figuring out how much they are paying for an annual membership fee at the gym as well as the cost of
one kick boxing class. Marie went to 10 classes and spent $200 total.
Stephen went to 25 classes and spent $275.
1. Find the cost per class.

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