Calculus is a field of mathematics that studies how things change. Particularly useful for engineers and physicists, calculus played a major role in the industrial revolution. Today much of the technology that we rely on--computers, Internet and cell phones--owe much of their functionality to calculus. Calculus has a broad scope of uses and therefore has applications in everything from understanding the concepts of relativity to finding patterns in statistical analysis.
If you are struggling to find the answers to a calculus problem, don't feel alone. Some of the most helpful people are the people around you such as other students or work colleagues. They are likely struggling with the same or similar problems and may be a great place to start. Often, these people will be the most understanding of your confusion and may be willing to share some of the ways they overcame the frustrations of learning. Teachers and professors are another resource. Seek them out during their office hours and ask for help. They are there to teach and have likely encountered students with similar problems in the past. A last resort can be finding and paying a tutor to guide you through the various calculus problems.
Check the back of your calculus textbook. Sometimes textbooks provide the answers to some of the problems posed in the text of the book. If you are struggling to understand the textbook you have, there are some supplemental books that will help you with the basics of calculus problems. "Calculus for Dummies" and "The Complete Idiot's Guide to Calculus" are two examples of books that can help you understand the concepts and problems posed in a textbook.
There are additional resources online to solve calculus problems. These websites are designed to help you solve specific problems. You can enter the elements of the problem and the website will generate an answer. While these problem solvers may provide a short-term solution, they are best used in moderation. Use the online solver to help you understand one or two problems, then try to learn the fundamentals so you can solve any problem with what you have learned.