a= 20

(a) By reading values from the given graph off, use five rectangles to find a lower estimate and an upper estimate for the area under the given graph offfromx= 0 tox= 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)