Question 52046
There are about six log rules that you need to memorize.  The two that we are using on this problem are:
1.  nloga (u) = loga (u^n) 
2.  loga (u) + loga (v) = loga (uv)

5logn (y) + 3logn (t)
logn (y^5) + logn (t^3)  Rule 1.
logn ((y^5)(t^3))  Rule 2.