The table indicates a relationship between two variables x and y.

x y
4 4.00
5 4.20
6 4.40
7 4.50
8 4.55
9 4.60

Assume y = f(x) where f is continuous, and approximate

using the Trapezoid Rule.

We can see from the table that h = 1, therefore answer is:

1/2(4.00 + 4.60 + 2(4.20) + 2(4.40) + 2(4.50) + 2(4.55)) = 21.95