Ronna answered 18 of the 20 questions on her second math test correctly. On the first test, she had answered only 15 of 20 questions correctly. What was the percent increase in her score from her first test to the second test? A. 15% B. 35% C. 75% D. 90

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

How to simply and write the answer n a whole number

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