A right Riemann sum with n = 3 subintervals is used to approximate the area under the curve of 3 f(x) = -x² + 18x + 9 over the interval [7, 8]. Is the approximation an underestimate or an overestimate? Select the correct answer below: O overestimate O underestimate

Estimate the area under the graph of f(x) = over x + 4 the interval [1, 3] using ten approximating rectangles and right endpoints. Rn Repeat the approximation using left endpoints. Ln Report answers accurate to 4 places. Remember not to round too early in your calculations. Question Help: D Video

over the interval (3, 5| using ten approximating || Estimate the area under the graph of f(x) = x + 2 rectangles and right endpoints. Rn Repeat the approximation using left endpoints. Ln Round answers to 4 places. Remember not to round too early in your calculations.