A scientist weighs a beaker at 30.68 grams. He adds 2.3 g of a substance. How many significant figures are there in the answer?

How do i do this? i don’t understand

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss

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