Question 1082984
<pre>
This is just a trial and error problem:

{{{4^1=4}}} <-- too small
{{{4^2=4*4=16}}} <-- too small
{{{4^3=4*4*4=64}}} <-- too small, but fairly close to 68
{{{4^4=4*4*4*4=256}}} <-- way too big.

So the closest is t=3.

If you were studying logarithms, you'd be able
to approximate the answer very closely as 3.043731421.

But that's not much bigger than 3, so 3 is an approximate 
answer.

Edwin</pre>