Please tell me how to solve below questions

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1) Consider the formula (Right hand rule), take the limit as n goes to infinity to find the exact value of??11?3x2dx

2) consider the formula found in question 1). take the limit as n goes to infinity to find the exact value of?14?(2x2?3)dx

3)

Consider the definite integral / 3x'dx. Set up the formula for approximation the definite integral using n rectangles and the Left Hand Rule. Evaluate the sum. Then select the equivalent answer below. O 3n - 6(n - 1) + 2(n-1)(2n-1) n O 3n - 6 (n + 1) + 2(n+1)(2n+1) n 0 6 - 12(n-1) 4(n-1) (2n-1) + n n2 0 6 - 12(n+1) 4(n+1) (2n+1) + n n2