Which of these statements is true for f(x) = 4.2*?​

Need on this geometry question. explain how you did it.

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

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