An isotope with a half-life of 15.0 seconds was produced as a byproduct of a nuclear a
reaction experiment. How many half-lives pass after exactly 60.0 seconds have elapsed?
Enter only a number

2nd person

hope this !

where is the

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

part a.   = c.)

part b. = a.)

explanation: