Answer
$2t^3+t^2+5t+9$
Work Step by Step
By combining like terms, the given expression, $
(7+4t-5t^2+6t^3)+(2+t+6t^2-4t^3)
$, simplifies to
\begin{array}{l}
(6t^3-4t^3)+(-5t^2+6t^2)+(4t+t)+(7+2)
\\\\=
2t^3+t^2+5t+9
.\end{array}
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.