A newly discovered radioactive isotope has a half-life of 2 minutes. Scientists isolated a sample of this isotope and measured its initial mass. After 10 minutes, 12.5 g of the isotope was left. What was the initial mass? need the answer asap! thanks

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

Jon’s weight loss for each week of the month is 5 lbs., 2.5 lbs., and 2.5 lbs. he gained 3.5 lbs. the last week. if jon originally weighed 198 lbs., how much does he weigh now?