2 1 S x + rule. Round the final result to five decimal places. Estimate the value of -dx by using n = 4 subintervals of equal width using the trapezoidal 1 Estimate the value of 5 S 2 2 +4 -dx by using n = 4 subintervals of equal width using Simpson's rule. '3 X' Round the final result to five decimal places. Suppose the measurements of a lake are shown in the figure. 15 feet 50 ft 18 feet 50 ft 32 feet 32 feet 24 feet I Use the trapezoidal rule and Simpson's rule to approximate the surface area of the lake. Assume each subinterval is 50 feet wide and that the distance across at the endpoints is 0 feet.