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How To: Digitally sign and encrypt your email messages

The only people who should read your emails are you and your intended recipients. Protect your privacy with this simple crytography guide, which shows how to obtain a free certificate for signing and encrypting email messages, how to download and install the certificate on Mac OS X 10.5, and how to use the newly installed certificate in Apple Mail.

How To: Solve a 3x3 linear system using Cramer's Rule

In this video the instructor shows how to solve a 3 x 3 linear system using the Cramer's rule. In this kind of problem you are given three equations in three variables x, y, z and you need to solve for the values of these equations. You can solve this using the Cramer rule which says that the value of x is Dx/D, where Dx and D are two different determinate. Now you have to figure out the determinate to get the value of variable x. The determinate D is called the foundation determinate and is ...

How To: Factor a trinomial, GCF, then unfoil

In this video the instructor shows how to factor a polynomial. A polynomial having three terms is called as trinomial. Now if you factor it you will obtain two binomials whose product will be the original polynomial. Before factoring a polynomial you need to find out if the polynomial has a GCF. Look out for the common variables in all the three terms and pull them out which is the GCF of the polynomial. This simplifies the original equation to a polynomial which is of lower degree. Now facto...

How To: Convert temperature using y = mx + b

In this video the instructor shows how to do temperature conversions using y = m*x + b. Now if Celsius is represented by the variable C and Fahrenheit is represented by the symbol F, you can replace then in the previous equation in place of the variables x and y giving you the equation C = m*F + b. Now to solve for the values of the constants m and b you need to have values of two sample temperatures in both Celsius and Fahrenheit. Take the first sample and substitute in the above equation gi...

How To: Factor a trinomial with negative leading coefficient

In this video the instructor shows how to factor a trinomial with negative leading coefficient. Most of the students are confused when they have to factor a trinomial with a negative leading coefficient. But there are many ways to solve these kind of problems as shown in this video. One way you can do is that take out the greatest common factor (GCF) of -1 from the equation. So pulling the -1 gives you the original trinomial with all the signs of the terms changed. Now go on and factor the ne...

How To: Solve a quadratic equation

In this video the instructor shows how to solve a quadratic equation. If you have a quadratic equation with complex fractional terms and you find that a particular term is repeating then equate that term to a new variable and replace the variable in the given equation. Now try to get the equation a*x*x + b*x + c = 0, and solve for the roots of the equation which gives the values of the intermediate variable. But this variable was replaced instead of another term. So equate that term to the va...

How To: Identify the rear axle on a Jeep Cherokee

Richpin's Auto Repair shows you how to properly identify the rear axle of a Jeep Grand Cherokee. This information will allow you to obtain the correct information for replacing this specific automobile part. The video will show you where you need to look beneath the vehicle to find out which style of rear axle your Jeep Grand Cherokee has. You'll be shown where to clean the dirt off of a specific area of the axle to obtain this important information. In this particular case, the rear end axle...

How To: Factor a trinomial by GCF then grouping

In this tutorial the instructor shows how to factor a trinomial with Greatest Common Factor (GCF) and then how to group it. The first thing you have to do when you want to factor a trinomial is look for the GCF. First factor the numerical coefficients of the terms of the equation. Now separate out the common numerical factor and if any common variable. This leaves you with a binomial to be factored. Now to solve this multiply the numerical coefficients of the first term and the last term and ...

How To: Simplify a quadratic formula result

In this video the tutor shows how to simplify a quadratic formula result. You can solve a quadratic equation using the quadratic formula. The first thing you have to do when given the quadratic equation is bring all the terms to one side so that you have a zero on the other side of the equals to sign. Now the formula to calculate the roots of the quadratic equation ax*x + bx + c = 0 is x = (-b + root of(b*b - 4*a*c) ) / 2 * a. The other root can be obtained by using the minus sign before the ...

How To: Install VMware and Windows XP in Ubuntu

Software expert David Steinlage guides the viewer through the step-by-step process of installing VMware and Windows XP on a computer driven by Ubuntu Linux. The first step is to get a serial number, which can be obtained free by visiting the site www.vmware.com and filling out the registration form. The VMware installer application Automatix is then opened and upon clicking the desired options, the installation of VMware starts automatically. At the end of installation, the user is prompted t...

How To: Derive the equation of a straight line

In this tutorial the instructor shows how to derive a straight line equation. He shows us a process that consists of two steps. In step one he uses the slope formula to obtain the slope of the line which is the ratio of difference of y-coordinates and difference of x-coordinates. Now in the step two he uses the slope he obtained in the first step and equates it two a another slope derivation which uses a generic x, y variables and a real point. Now solving this equation he arrives at the equa...

How To: Sell stuff at a flea market

Selling stuff at the local flea market sounds easy enough, but it isn't anything like having a yard sale. There's a lot more to it that just getting rid of your junk, and the biggest things are being licensed and having a sales tax number. Flea market vendor may not be your first career choice but, like many, you may find it’s a lucrative full-time job or a profitable and fun sideline.

How To: Find the equation of a line easily

This is the video about how to Find the equation of a line. The equation of a line with a defined slope m can also be written as follows: y = mx + b where m is the slope of the line and b is the y intercept of the graph of the line. The above form is called the slope intercept form of a line. Step1 Set m to a fixed value (m = 1) and change b (b = 1, 2, 3, 4, -1, -2, -3, -4). Compare each value of b to the y-intercept of the line obtained. Step2 Set b to a fixed value (b = 1) and change m (m =...

How To: Use creative mode in Minecraft 1.8 to build a world

So you've just installed Minecraft 1.8 on your computer, and you're trying to figure out how to use the cooler options of creative mode. Where do you start? This guide will show you how to destroy blocks, create buildings with blocks, manage your inventory, obtain unlimited blocks, and use fly in creative mode while playing Minecraft 1.8.

How To: Do the Dutch hakken dance to Gabber hardcore techno music

In The Netherlands, Gabber Hardcore is the music of choice for rebellious young people, much like punk and underground hip-hop in the US. It is a blisteringly fast style of electronic music which might seem hard to dance to at first. Enter the hakken, the dance of choice for the Gabber listener. Watch this video to learn how to do the hakken, and you will know what to do next time you're at a hardcore club in Holland.

How To: Find the slope's unit of measure

This educational video from free math tutoring shows how to calculate the slope of a line and assign units to the answer obtained. This video assumes that the viewer is familiar with the concepts of axes and co-ordinate geometry. The narrator uses a commonly used formula to calculate the slope of the line in the first section of the video. In the second section, the narrator demonstrates how to assign units to the answer, as per the question asked.

How To: Customize white balance & temperature for perfectly colored photos & videos

Has white balance always been a problem in your photographs? Getting the perfect color in your photos is tricky business, even on digital cameras. This video will give you the ultimate information on customizing the white balance and color temperature for your film, video footage and pictures. Ritwika teaches how to obtain accurate color balance using various custom white balance techniques.

How To: Crochet a rag rug from recycled cotton bed linens

Recycle your old bedclothes and obtain a fashionable rag rug in the process! Learn to make a rag rugs from old linens with this green crafter's guide. While this tutorial is geared toward people already posessing some knowledge of crocheting, beginners should be able to follow along provided they understand the bare essentials. For more information, and to get started making your own rag rugs, watch this free video crochet lesson.

How To: Make a votive candle holder by hand

If you don't know what votive candles are, they're basically prayer candles that are used to offer votive. They're usually small short candles or tall ones. In this tutorial, you'll be finding out how to make these candles using easy to obtain materials. It will save you money on buying some and also give you a little project to work on. Enjoy!

How To: Make king crab cakes stuffed with lobster tails

In the spirit of foods stuffed with other foods such as Turducken and macaroni and cheese stuffed meat loaf, comes this seafood inside seafood dish. This video tutorial shows how to make King Crab stuffed lobster tails. This gourmet meal is surprisingly easy to pull off, provided you’re working with some decent crustaceans.

How To: Use SUMPRODUCT for deposit calculations in Excel

Excel Magic Trick 475 talks about Sumproduct for bank deposit calculation. Here, the total money can be calculated by just a click. Total is taken as Sumproduct and can be obtained by clicking on the number of bills that get added to give the final checked amount. If these steps are followed, the viewers will find themselves in a new world of deposit and bill calculation

How To: Learn to whistle

You'll never have to hum along to your favorite tune again. With a little practice, you'll be whistling in no time! Watch this video to learn how to learn to whistle.

How To: SSH into a server

This video demonstrates how to use SSH to connect remotely to your server using its IP address. If you do not have the IP addres of your server, you'll need to obtain it before SSHing into your computer from a remote location. Watch this tutorial for a step-by-step walkthrough of the process.

How To: Make a cheap corpse head prop for Halloween

Dr Kreepy, Halloween crafter, shows how to obtain a rotting head without killing someone! For this project, you will need a skull, paintbrushes, liquid latex, black spray paint, brown paint, and cotton balls. Watch this video prop-making tutorial and learn how to make a cheap corpse prop head for Halloween.

How To: Insert a catheter into a cow for a urine sample

Sometimes it is necessary to insert a catheter into a cow to obtain a urine sample. Catheterization can be a tricky process, but urine samples are a helpful diagnostic tool for many veterinarians to detect illness and other medical problems in cattle, as well as other animals. Learn how to insert a catheter into a cow to collect a urine sample by watching this video veterinary tutorial.