Answer: The rock is 2000785 years old.
Explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample
a = initial amount of the reactant = 800
x = amount of daughter isotope = 600
a - x = amount left after decay process = amount of parent isotope = (800-600) = 200
Half life is the amount of time taken by a radioactive material to decay to half of its original value.




The rock is 2000785 years old.
A vernacular region may also be called a perceptual region.
You would go through these is this general order:
Palaestra- exercise room, socialization, preparation for baths basically
Apodyterium- changing room, to get... changed?
Tepidarium- warm bath room, spend time sitting in a warm room. Prepare for the next room
Caldarium- hot bath room, hot water to soak in. After that slaves come rub you down with olive oil (soap was not invented yet)
Frigidarium- cold plunge bath, rinse down the oil with cold water
All hot room were heated by hypocausts, a way of hot air circulating through walls and beneath the floors
tada