9.20 through 9.23 For the area shown, determine (a) the exact value of the moment of inertia Ix by formula, (b) the approximate value of the moment of inertia I, if

the area is divided into 10 horizontal strips of equal width, and (c) the percent error in the approximation. Percent error is equal to 100 (approximate Ix-exact Ix)/exact Ix. 150 mm 250 mm X