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A function f, a closed interval [a, b], and a number of equally spaced subintervals n...

A function f, a closed interval [a, b], and a number of equally spaced subintervals n are given. Complete the following. f(x) = 7x; [1, 4]; n = 6 (a) Calculate by hand the Left Sum to approximate the area under the graph of f on [a, b]. (b) Calculate by hand the Right Sum to approximate the area under the graph of f on [a, b].

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