A continuously-decreasing function that is concave up on the interval [2, 6] is represented by the table. X 2 3.3 4.4 5.5 6 f(x) 0.5 0.303 0.227 0.182 0.167 Part A: Find the left Reimann sum estimate of ( f(x) dx, based on the subintervals given in the table. (4 points) Part B: Write the midpoint Reimann sum that estimates ( f(x) dx, based on the subintervals given in the table. (4 points) Part C: Determine whether the left Reimann sum estimate is an overestimate or an underestimate, based on the properties of the function. (2 points)