Here's the question you clicked on:
fra1234
Are there solutions to problems of Gilbert Strang's free textbook? In other words, is there any way to check if my answers are right?
Could you post a link to where you downloaded the textbook? Else we don't know what textbook you refer to.
http://ocw.mit.edu/resources/res-18-001-calculus-online-textbook-spring-2005/textbook/ but I guess there aren't. Nevermind