For information on Mathematics, Science, Music, Geography, Engineering, colours….. the list is long!
For further information on WolframAlpha these links may be useful:
From h+ Magazine a comprehensive Users Guide to WolframAlpha
Step-by-Step Math – WolframAlpha blog post
Training Video from Russell Stannard – Teacher Trainng Videos
10 questions younger children could try – Wolfram Alpha Blog entry
Mathematics Learning and Web 2.0 WolframAlpha pages.
It is very good at Mathematics! Try the following:
Type in: solve 3x+7 = 13 and then enter.
Note that you have the option to show the steps when the results are returned.