4. Let f [a, b] → R be Riemann integrable and non-negative (i.e. f(x) ≥ 0 for all x € [a, b]). cb Prove that f≥ 0. a Hint: Prove first that for any partition P of [a, b] it holds that U(f, P) ≥ 0.

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A: Let f be a function continuous on .To Show:If P is a partition of  then  are all Reimann Sums.

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A: To prove this statement, we can use the definition of continuity.

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Q: = [[ F - a5, I = S F = î4æz – jy² + kyz 1

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