The rectangles in the graph below illustrate a right endpoint Riemann sum for f(x)=4sinx on the interval [0,π]. The value of this Riemann sum is

Question

Answer 1

R₄ = (4sinπ/4 + 4sinπ/2 + 4sin3π/4 + 4sinπ)·π/4 = (2√2 + 4 + 2√2 + 0)·π/4 = (√2 + 1)·π = 7.58448