Here is the question:
Let $ P = \{−3,−1.5,1,2,3\} $ be a partition of $[−3,3]$. Let $f(x) = 9 − x^2$ . Determine values for $L(f, P)$ and $U(f, P)$
Verify that $L(f, P) ≤ \int_{-3}^{3}f(x)dx ≤ U(f, P) $ using calc-II methods for computing the integral.
I understand $(,)=\sum_{i=1}^{n}m_i(_−_{−1})$ and $(,)=∑_{=1}^{}_(_−_{−1}) $, but I don't understand how to apply it to this. I would really appreciate some clarification (Hopefully with explanation) :)