Radium decays according to the function Q(t) = Qoe-
where Q represents the quantity remaining after tyears and kis the decay
constant 0.00043. How long will take for 500g of radium to decay to 5g?

Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?