A dog groomer charged $77.99 to groom three of Mrs. O'Connell's dogs. Mrs. O'Connell wants to tip the groomer about 15%. What
is the exact amount for the tip? ( show work please)

Situation: find the age of the skull to the nearest year, enter the correct answer. a hiker in africa discovers a skull that contains 32% of its original amount of c- 14. done n = noekt 00000 no = inital amount of c-14 (at time t = 0) n = amount of c-14 at time t k = 0.0001 t = time, in years