These notes give an excellent explanation of all the topics we will cover. There are also many more examples and practice problems (with solutions) for you to take a look at.
A great tool - if used correctly. Sure, you can find the answers to any problem you might have to solve in this class - but you still need to understand how to solve them yourself! Don't abuse this tool.
It should also be pointed out that there is a Wolfram Alpha app (which can be found here. This app is available on all major devices, is relatively cheap and comes with a step by step calculator that can help you understand how to solve the problems you are assigned.