(Solved): 1. Give the Riemann sum approximation for the definite integral 19x31dx using n=4 subinter ...

1. Give the Riemann sum approximation for the definite integral ${?}_1^9\frac{1}{x^3}dx$ using $n=4$ subintervals and midpoints. Leave your answer as an expanded sum. You cannot use the Fundamental Theorem of Calculus to solve this problem. 2. Give the Riemann sum approximation for the definite integral ${?}_2^8\frac{1}{x}dx$ using $n=5$ subintervals and left endpoints. Leave your answer as an expanded sum. You cannot use the Fundamental Theorem of Calculus to solve this problem.