Math Is Fun Forum

Hey guys. I have a problem here. Can anyone help me figure out the charts? And if you know, please advise a program in which it is most convenient to deal with graphs and charts. I'm currently using the services of the guys from http://www.wallstreetoasis.com/resource … -of-graphs. But I would really like to learn how to do it myself. I even rather need this skill. My job involves constantly presenting information in graphs and charts. I also heard that  a powerful computer is needed for this kind of work. Is it true? If so, it's worth buying a new computer, too. Thank you in advance to all who respond.