Question 918405
Assuming exponential decay,
c, how many ounces of chemical in the pool
t,  amount of time after chemical addition, in hours
0.05 of amount lost every hour means 0.95 of amount is kept every hour.
{{{c=16(0.95)^t}}}----you could also choose a somewhat different format using base e, but the one chosen here should be understandable.


The question signifies, let {{{c=(3/4)16=12}}} and solve for t.  Use t to determine the time during the day when this 12 ounces is reached.