How to pass level 4 in st math 5th grade challenge

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

What is the following product? sqrt 30 • sqrt 10

What is a health benefit of eating protein? a. builds muscles b. provents infections c. increases immunity d. decreases red blood cells