What are 3 real world examples of dilations or stretches?

I’m really confused and need your assist me with this question i’ve never been taught

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

Predict which statements are true about the intervals of the continuous function. check all that apply