(Solved): please answer question 13. Using the Midpoint Rule In Exercises 13-18, use the Midpoint Rule with n= ...

Using the Midpoint Rule In Exercises 13-18, use the Midpoint Rule with $n=4$ to approximate the area of the region bounded by the graph of $f$ and the $x$-axis over the interval. Sketch the region. See Examples 2 and 3. Function 13. $f(x)=2x^2$ 14. $f(x)=x^2-x^3$ 15. $f(x)={\left(x^2-4\right)}^2$ 16. $f(x)=\sqrt{x^2+3}$ 17. $f(x)=\frac{1}{{\left(x^2+1\right)}^2}$ 18. $f(x)=\frac{2}{x^2+1}$ Interval $[1,3]$ $[0,1]$ $[-2,2]$ $[-1,1]$ $[-1,3]$ $[0,2]$