Answer:
Canes Venetic, Centaurus, Coma Berenices, Corves, Crux, Musca and Virgo. Canes Venetic and Coma Berenices are northern constellations, while Centaurus, Virgo, Corves, Crux and Musca lie
Explanation:
Set this up as
10 = 40 (1/2)t/28
and solve for t in years.
10/40 = (1/2)t/28
log(0.25) = (t/28) log(0.5)
t = 28 log(0.25) / log(0.5) years = 56 years
Test the answer:
56 years = 2(28 years) = 2 half-lives, so the remaining amount should be 1/2 of 1/2 of the initial amount, i.e. 1/4 of the initial amount, and 10 mg = 1/4 of 40 mg.
It is wet because it is touching the water. it is a natural habitat, so the fish itself does not feel wet.
