How do I solve for this question?

(a) Use the Midpoint Rule with n = 3 to approximate the integral. (Use decimal notation. Give your answer to three decimal places.) // ~ : o 1+x3 (b) Estimate the error in using the approximation. (Use decimal notation. Give your answer to three decimal places.) (c) Determine the number of subintervals needed to guarantee that an approximation has an error less than or equal to 0.0001. (Give your answer as a whole or exact number.) n