Approximate the Area Under the Graph Of $f(x)=-x^{2}+9$ From $x=-1$ To $x=3$ And Above The

Short Answer

Approximate the area under the graph of $f(x)=-x^{2}+9$ from $x=-1$ to $x=3$ and above the $x$ -axis, using four rectangles. Let the height of each rectangle be the function value at the midpoint of the interval.