Pablo deposited $57 into a savings account for which interest is compounded quarterly. according to the rule of 72, what interest rate will cause his money to double in approximately 44 years?

Hi there

The rule of 72 is
72/time=rate
72÷44=1.6%

Hope it helps

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.