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4. Let f(x) = 2x + 4 be a function defined on [0, 2], (a) i. Write down a closed formula (without the summation notation )) for the the N-th right endpoint approximation RN for f. ii. lim RN =. N-+0o b) Recall that f(x) = 2x + 4 on [0, 2]. i. Suppose that PN : 0 = X0