Linear Correlation Coefficient

The text book that I am using does not explain step by step how they used the linear correlation coefficient equation to get the answer. When I tried, I got a numvber in the thousands, which I am aware is definately not the right answer since I am looking for an answer between -1-1 I need help using this equation!! Does the variables of X and Y make a difference to the equation? ARGH! PLease help me to use this equation!