You plug the values into the formula for calculating Simpson's rule and there you are.
First you need to look in your text book to discover what Simpson's rule is.
I can't remember it off hand, but it concerns taking two subintervals together. Here you'd use 1 -> 1.5 -> 2 as one pair of subintervals and 2 -> 2.5 -> 3 as the other. These are the x values.
Then the y values are the values of the function at each of these values, which have been provided for you.
It's now just a matter of arithmetical calculation.