Why dose the equation y = 3x + 5 is not represented as a proportional relationship?

Find the balance at the end of 4 years if 1000 is deposited at the rate of

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

The longer leg of a 30-60-90 trangle is 18