Estimate the minimum number of subintervals to approximate the value of a. the error estimate formula for the Trapezoidal Rule. b. the error estimate formula for Simpson's Rule. The minimum number of subintervals using the Trapezoidal Rule is 49. (Round up to the nearest whole number.) The minimum number of subintervals using Simpson's Rule is 10. (Round up to the nearest even whole number.) 1 -4 dx with an error of magnitude less than 10 using 5x+8