in. Plot[9-x^ 2, {x,-3,3}, PlotStyle->Thick, Filling- >Axis, GridLines->Automatic] Then press shift enter Step 6: Now we are ready to find the area, using the Integrate command. Integrate[9-x^ 2, {x, -3, 3}] Then press shift enter ? Questi The squre grids on the grap will give you the approximate area Hint 1 Based on the above practice problem, what is the area of the region? Question Help: Message instructor Submit Question 30 AStep 5: Since we will calculate with the right Reimann Sum, we need to create another function for the x- coordinate of each rectangle. z' is the counter (1 for the 1st rectangle, 2 for the 2nd rectangle, etc.) x[i_,a_,b_,n_]:=a+i*delta[0,3,n] Then press Step 6: Now we are ready to approximate the area, using 71 = 4 rectangles, using the right corner of each rectangle. The area of each rectangle is f(3:)A:c . In this case, x is the right endpoint of each subinterval, and x) is the corresponding height, and A3: is the width of each rectangle. Then we use the Sum command to add the area of each rectangle (using i from 1 to 4)