Bismuth-212 has a half-life of 60.5 minutes. find the amount of bismuth-212 left from a 100-gram sample after 242 minutes

Notice that 242 = 4*60.5. This means after 242 minutes, the sample decays to of its original amount. So you end up with

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or