Evaluate each integral using the definition of the definite integral with right endpoints (given in Theorem 4 of the book) and

Question

Evaluate each integral using the definition of the definite integral with right endpoints (given in Theorem 4 of the book) and taking the limit. 
(a) ∫₀³ (x² +2x-5)dx
(b) ∫₁⁵ x³ dx
Δx=b-a/n=
xi=a+iΔx=

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