Dana is trying to walk 12 miles every week. she walked 3 miles on monday and 5 miles on wednesday. how many more miles does she have to walk this week in order to reach her goal

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