Salvatori charges $9 per hour for babysitting kendra chargers $8.50 per hour if they both work for 6 hours how much more money would salvatori earn?

Situation: an archaelogist in turkey discovers a spear head that contains 54% of its original amount of c-14. n = noekt 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 find the age of the spear head to the nearest year