The mass decay rate is of the form

where
m₀ = 3000 g,the initial mass
k = the decay constant
t = time, years.
Because the half-life is 30 years, therefore

After 60 years, the mass remaining is

Answer: 750 g
Answer:
nearer to the north pole
Explanation:
because there is more water, which is basically gone everywhere else on Mars except for the south pole which has less water than the north pole
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