- - - - - - = = 18 feet 15 feet 32 feet 24 feet 32 feet - - - - -. -. 50 ft 50 ft 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. a.) Trapezoidal rule: 6050 units O Simpson's rule: 9600 units? b.) Trapezoidal rule: 12100 units O Simpson's rule: 19200 units c.) Trapezoidal rule: 6050 units O Simpson's rule: 6400 units2 d.) Trapezoidal rule: 5075 units O Simpson's rule: 7575 units