Answer: day six. A=3, b=2, t=0 to t=5, covering 6 days. $3, $6, $12, $24, $48, $96.
Step-by-step explanation:
. A is the starting amount at t=0. b is the base, two because the amount doubles each day. b would be 3 if it tripled every day. t is the final day number, counting from zero.






We can also do this with units included.
Obviously the unit for A is dollars, and t is in days. But what is the unit for b?
Well, the amount doubles once _per day_. So try b = 2 per day = 2/day. That doesn't work. The correct value for b including units is
.
So if you wanted to express time in weeks while still doubling once per day, you would multiply by a value equivalent to one,
, and cancel units:
.
