The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. starting with 170 grams of a radioactive isotope, how much will be left after 4 half-lives? use the calculator provided and round your answer to the nearest gram.

It will be left 11 grams of the radioactive isotope after four half-lives

Step-by-step explanation:

Let's calculate the first four half-lives of the radioactive isotope, this way:

1. First half-life:

170 * 0.5 = 85 grams

2. Second half-life:

85 * 0.5 = 42.5 grams

3. Third half-life:

42.5 * 0.5 = 21.25 grams

4. Fourth half-life:

21.25 * 0.5 = 10.625 grams = 11 grams (Rounding to the nearest gram)

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.