how do you determine the fraction of parent isotope remaining after 20,000 years if the isotope used has a half life of 5000 years

Adice is rolled 5 times. how many possible rolls are there? ( determine the number of outcomes using only the fundamental counting principal )

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Michelle had a birthday party. she bought a bag of candy with 96 starbursts, 72 hershey's, and 68 reese's. she wants to use all the candy she bought to make goody bags with the same amount of starbursts, hershey's and reese's in each bag. what is the largest number of bags she can make?