Old MathJax webviewsolve question 6 using q3solve question 7 using q3 3 (Sections \( 5.1 \) ) (a) Estimate the area under the graph of \( f(x)=4-x^{2} \) from \( x=-1 \) to \( x=2 \) using three approximating rectangles of width 1 and right end points. (b) Repeat part(a 1 answer