Question

Choose the situation which would best be modeled by an exponential decay function.

A) An island is being eroded away and loses 10% of its beachfront every year.
B) A player's batting average decreases by .025 for each year he is in the major leagues.
C) A bank account has fallen below a minimum balance and is being charged $1.50 per day in fees.
Eliminate
D) A machine depreciates (loses value) by $1000 in its first year, by $2000 in its second, $3000 in its third, etc.

Answer 1

exponential decay is if it decreases at a rate proportional to its current value.

so its A

Answer 2

A) is the answer. The island in decaying by 10% each year, which means the amount will change within the period of the decay.

Hope this Helps! :)