Question 551190
{{{-30/(t(t+4)^2)}}}



{{{-30/(-6(-6+4)^2)}}}



{{{-30/(-6(-2)^2)}}}



{{{-30/(-6(4))}}}



{{{-30/(-24)}}}



{{{5/4}}}



So {{{-30/(t(t+4)^2)=5/4}}} when {{{t=-6}}}