 If you want to add math formulas to your handouts without having to pay for a product like MathType, you can go and install LibreOffice, it's at LibreOffice.org, and if you download the normal version you have to be the administrator to install it. That won't work here at the school, so you can download the portable version and install that instead and it will install to a USB chip and you can take it every place you'd like. So here we are in the word processor. And what I'm going to do is I'm now going to insert a formula. I've set this up so that my original font size is going to be 24 points so that you can read things a little bit easier. Now I could point and click for all the things that I want, but it's easier for me to type them directly. So let's say I want the variance s squared sub x and that is equal to n times the sum of x squared and I do not want the parentheses so I'll get rid of them here, minus the sum of x squared. Now that's all over n times n minus 1 so I have to group this and I use curly braces to group things so that's over n times n minus 1. And there it is typeset for me. Well this is good, but let's add some more to it so I can say sum from i equals 1 to n. So I'm going to have here from i equals 1 to n and then I'm going to put here x sub i and then I need the same thing on this other sum from i equals 1 to n and x sub i. And now you'll notice that the parentheses are not quite scaled the way I'd want. One thing that you can do if you're not sure how to do it is you can come down here and I can look for my brackets and one of them here is round brackets scalable. So I'm just going to click this and insert that and the way you do it it turns out is you say left open parenthesis and right closed parenthesis. Well now that I know that I can just come back here and take this and change it to a left open parenthesis and this one will be a right closed parenthesis and now it scales very nicely. When I click outside of the formula I come back to my word processing document and there I have it. And at this point I can save the document so let me save this as and I'll just put it on my h drive as formula dot odt but I don't have to save it in that format if I don't want to. First of all I can export it as a pdf and the other thing I can do is I can save it in Microsoft dot x format. It'll give me a warning asking me if I really want to do that but yes I can do that. Now let's say you want to add a graph to your handout. You can download maxima which is a computer algebra system and it does graphs in addition to things like solving and simplifying equations. So let's look at the graphing capabilities of this. And let's just put in a simple function. So let's say f of x becomes 2 times x plus 3. You press shift enter and that is how you say you're done with that line. Now I can say let's do a 2D plot of f of x and we want the range of x from negative 5 to positive 5. And when I press shift enter I get a window that has my drawing in it and I can copy that plot to the clipboard come back to my word processing document and paste it in. You'll notice that the y axis is labeled 2 times x plus 3 which is probably not what I want. So what I can do is I can come back here into maxima and I can say I would like my y label to be just the letter y. I have to use double quotes by the way not single quotes on this and if I press shift enter again now I have the plot the way I want it with the letter y instead. I can copy that to the clipboard, get rid of the old one and paste in the new one. What if I need to draw more than one function at a time? Well I can do that easily enough so let's go back here and this time I'm going to do another plot 2D and I'm going to have f of x and inside the square brackets I'll just put another function directly. How about oh let's say 4 times x minus 5 and again I want x from negative 5 to positive 5 and I want my y label to be the letter y. And now I get both of those and you'll notice that up in the upper right hand corner of the drawing is the legend. Well if I'm doing a handout that's great. If I want doing a test and I want people to identify which one is which I probably don't want them labeled. So how do I avoid getting a label? I go back here and I add another set of options and say I want the legend on the graph to be the empty string and now when I plot it I get just the plain plot without any identifying information that would give the students the answer in advance. Sorry about the abrupt jump there in the editing but I was too lazy to re-record the entire previous segment. To make it up to you here are some cat pictures. Okay it's also possible to plot things more than linear equations so for example I can do a 2D plot of x squared minus 3 and let's do that from x as negative 5 to positive 5 and there's that and I can do 3D plots as well. So for example let's do a plot 3D of and now I don't need the square brackets by the way because I can only do one 3D plot at a time. Let's do x cubed minus x times y plus y squared and let's see what that looks like when we have x from negative 5 to 5 and y from negative 5 to 5 also. And there's a nice 3D plot which I can either copy to the clipboard or I can export to a file in either PNG format, PDF or as a scalable vector graphic. As long as I'm in maxima I might as well show you some of the other things that can do. One of the things that can do is do rational simplification of expressions such as for example x plus 3 times x minus 6 times x plus 7 and it can also do factorizations. So if I wanted to factor x squared plus 4 times x minus 45 it would give me x minus 5 and x plus 9 and it can also solve systems of linear equations. So if I wanted to solve x plus 2 times y equals 7 and 3 times x minus 5 times y equals 10 and I wanted the solution for x and y, maxima would give that to me. Now maxima has a lot more applications than this it has a lot more features and I can't go into them all in a simple video but if you're interested in the kinds of things you can do I strongly encourage you to download it and take a look at the documentation. So again the tools that I'm using are LibreOffice.org which allows me to type in formulas and have them type set as I type them and maxima which lets me do plots and that's the good way to make handouts and exams that are customized for your course.