Let t be a trapezoidal rule approximation to s = integral a and b (3x-x³)dx. Which of the following statements must be true?
1) The trapezoidal rule provides an exact approximation of the integral.
2) The trapezoidal rule underestimates the value of the integral.
3) The trapezoidal rule overestimates the value of the integral.
4) The trapezoidal rule provides a lower bound for the value of the integral.
5) The trapezoidal rule provides an upper bound for the value of the integral.
