Question 948952
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Size doubles every half-hour.
{{{N=N[o]2^x}}}, using x for {{{1/2}}} hour periods.


x=2 periods, t=1 hour;
{{{highlight(2x=t)}}}------you want this to make sense.
One hour is two periods.


Note, the N equation is initially formed using x.
Solve for x...
{{{highlight(x=t/2)}}}.


Now, rewrite the N equation using time as t.
{{{highlight(N=N[o]2^(t/2))}}}.