You have a sample of a radioactive isotope of an element called "mysterium." The
half life of "mysterium" is 16 days. If you start with a 300 g sample of "mysterium,"
what mass of "mysterium"will remain after 64 days?

19.14g

Explanation:

t½ =16 days

N₀ = 300g

N= ?

t = 64 days

t½ = 0.693 / λ

λ = 0.693 / t½

λ = 0.693 / 16

λ = 0.043

N = N₀ e⁻λt

N = 300e⁻⁰.⁰⁴³*⁶⁴

N = 300 * 0.0638

N = 19.14g

The amount of mysterium sample left after 64 days is 19.14g

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.