Henry predicted whether he got answers right or wrong in his 50 question exam. He identified the 37 questions he thought he got right.
It turns out that Henry got 5 questions wrong that he thought he got correct and he only got 3 of the questions wrong he had predicted.
What is the percentage accuracy he had with predicting his scores?

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