"""
A veterinarian has instructed
Harrison to give his 75 -pound dog
one 325-milligram aspirin tablet for
arthritis period the amount of
aspirin, A, remaining in the dog's
body after ten minutes can be
expressed by A(t) = 325(1⁄2)^t/15.
How long will it take for the
amount of aspirin to drop to 50mg?
Solve algebraically.
50 = 325(1/2)^t/15
2/13 = 1/3^t/15
log1/2(2/13) = t/15
15 * log1/2(2/13) = t
t = 40.507
about 40.5 minutes
"""