element x is a radioactive isotope such that every four years, its mass decreases by half. given that the initial mass of a sample of element X is 300 grams, how long would it be until the mass of the sample reached 90 grams

1. if we have 3 babies what is the probability they’re going to be all boys? 2. if we roll 2 die at the same time what is the probability of getting less than 10 on the first roll and a 5 on the second roll 3. if we have 3 babies what is the probability their is going to be 2 girls? 4. if we have 3 babies what is the probability of having no more than 1 girl? 5. it we have 3 babies and then have another 3 babies what is the probability of us having at least 1 boy and then having all girls?

These box plots show the number of electoral votes one by democratic and republican presidential candidates for the elections from 1984 through 2012. which statement best compares the spread of the data sets

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges