Find the Riemann sum for f(x) = x² + 3x over the interval [0, 8] (see figure), where Xo = 0, x₁ = 1, X₂ = 3, X3 = 5, and x4 = 8, and where = C₁ = 1, C₂ = 2, C3 = 5, and C4 8. y 100

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