posted by Katie on .
The function f is continuous on the closed interval [1,7] and has values in the table below
Usinf the subintervals [1,4] [4,6] [6,7] what is the trapezoidal apporx. of the integral from 1 to 7 of f(x)dx?
The answer: 160
I tried doing each interval as separate integrals and then using TRAP and then adding them but I got 180. How do I get the right answer?