a = 20
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(a) By reading values from the given graph of f, use five rectangles to find a lower estimate and an upper estimate for the area under the given graph of f from x = 0 to x = 40.
A(lower estimate)
A(upper estimate)
(b) Find new estimates using ten rectangles in each case.
A(lower estimate)
A(upper estimate)
for (a) i got the width (40-0)/5 which is 8...but it says estimate using 5 rectangles...how would i get the area of 5 rectangles if the width is 8....
same problem with (b)