Let $$t$$ be a function such that $$t(-x) = -t(x)$$ for all $$x$$. If $$\displaystyle\int_1^3 (t(x) + x^2)\,dx = 18$$, then $\displaystyle\int_{-3}^{-1} (t(x) + x^2),dx =\ ?

Let $$t$$ be a function such that $$t(-x) = -t(x)$$ for all $$x$$. If $$\displaystyle\int_1^3 (t(x) + x^2)\,dx = 18$$, then $$\displaystyle\int_{-3}^{-1} (t(x) + x^2)\,dx =\ ?$$