The area of a circular sun spot is growing at a rate of 1,200 km2/s.
(a) how fast is the radius growing at the instant when it equals 5,000 km?

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