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12-41.
  1. Multiple Choice: The function f is continuous on the closed interval [3, 9] and has values given in the table below. Homework Help ✎

    x

    3

    4

    7

    9

    f(x)

    50

    40

    20

    30

    Using the subintervals [3, 4], [4, 7], and [7, 9], what is the trapezoidal approximation of ?

    1. 160

    2. 185

    3. 200

    4. 210

    5. 300

Be careful! The subintervals have different widths.