I need help with this question pls help
1 answer:
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Compound interest:
where
is the amount you start with, 
is the interest rate, 
is the number of times interest is compounded per year, and 
is amount of time that passes.
where
Hi! hope this helped
B(d) is a function of the number of days d since she opened the account.B(0) is the balance at day=0 now, since the length of segment OA is half of the length of segment OB, and the length of segment OB is proportional to the max balance, namely $400, then the segment OA is proportional to 400/2=200
