The half-life of a substance is how long it takes for half of the substahce to decay or become
harmless (for certain radioactive materials). The half-life of a substance is 235 years, and there is anamount equal to 100 grams now. This function can be modeled by the expression A(t) = 100(0.5)
t/235

Part A: Discuss collaboratively: How can the expression for the amount, A(t), that remains after t
years, be rewritten using a base of 2 instead of a base of 0.5? Explain.

Part B: Using either one of the exponential models, what is the amount of substance remaining
(rounded to the nearest tenth) after 1,000 years?
I