The amount of plutonium remaining from 1 kilogram after x years is given by the function
W(x)=2 -x/24,360
a.) How much will be left after 2000 years?
b.) How much will be left after 9000 years?
c.) How much will be left after 13,000 years?
d.) Estimate how long it will take for the 1 kilogram to decay to half it's original weight.