Summarize the following:
Simple 4-function calculators will not be able to help you directly find the inverse. However, due to the repetitive nature of the calculations, an advanced graphing calculator, such as the Texas Instruments TI-83 or TI-86, can greatly reduce the work. First, enter your calculator’s Matrix function by pressing the Matrix key, if you have one. On the Texas Instruments calculators, you may need to press 2nd Matrix. To reach the submenu, you may need to use the arrow buttons or choose the appropriate function key at the top of your calculator’s keypad, depending on the layout of your calculator. Most calculators are equipped to work with anywhere from 3 to 10 matrices, labeled with letters A through J. Typically, just choose [A] to work with. Hit the Enter key after making your selection. This article is focusing on 3x3 matrices. However, the calculator can handle larger sizes. Enter the number of rows, then press Enter, and then the number of columns, and Enter. The calculator screen will show a matrix. If you previously were working with the matrix function, the prior matrix will appear on the screen. The cursor will highlight the first element of the matrix. Type in the value of the matrix you wish to solve, and then Enter. The cursor will move automatically to the next element of the matrix, overwriting any previous numbers.  If you wish to enter a negative number, use your calculator’s negative button (-) and not the minus key. The matrix function will not read the number properly. If necessary, you can use your calculator’s arrow keys to jump around the matrix. After you have entered all values of the matrix, press the Quit key (or 2nd Quit, if necessary). This will exit you from the Matrix function and return you to the main display screen of your calculator. First, reopen the Matrix function and use the Names button to select the matrix label that you used to define your matrix (probably [A]). Then, press your calculator’s inverse key, x−1{\displaystyle x^{-1}}. This may require using the 2nd button, depending on your calculator. Your screen display should show A−1{\displaystyle A^{-1}}. Press Enter, and the inverse matrix should appear on your screen.  Do not use the ^ button on your calculator to try entering A^-1 as separate keystrokes. The calculator will not understand this operation. If you receive an error message when you enter the inverse key, chances are that your original matrix does not have an inverse. You may want to go back and calculate the determinant to find out. The first calculation that the calculator will give you is in decimal form. This is not considered “exact” for most purposes. You should convert the decimal answers to fractional form, as necessary. (If you are very lucky, all your results will be integers, but this is rare.) Your calculator probably has a function that will automatically convert the decimals to fractions. For example, using the TI-86, enter the Math function, then select Misc, and then Frac, and Enter. The decimals will automatically appear as fractions. Note: The calculator will not format the matrix until after the enter/equals key has been used (i.e. everything will be one line and not pretty).

summary: Select a calculator with matrix capabilities. Enter your matrix into the calculator. Select the Edit submenu. Select a name for your matrix. Enter the dimensions of your matrix. Enter each element of the matrix. Quit the Matrix function. Use the inverse key to find the inverse matrix. Convert your inverse matrix to exact answers. Most graphing calculators also have square bracket keys (on TI-84 it's 2nd + x and 2nd + -) which can be used to type in a matrix without using the matrix function.


Summarize the following:
Animal shelters often have tons of great dogs available for adoption.  As long as you know what you’re looking for in your new pet, you will probably be able to find a suitable dog at a shelter near you.  Shelters also have many different breeds of dog available, so if you aren’t set on a particular breed, this can be a good way to get acquainted with several different ones before deciding.  The staff at animal shelters are often familiar with many different breeds of dog so they can probably help you decide which might be the best fit for you.  Don’t get discouraged if you don’t find your new companion right away.  You may have to look at a lot of shelters, and a lot of dogs, before you find the one that is the right fit for you. There are also rescues for just about every breed of dog.  If you have a specific breed in mind, this may be a good option since all of their dogs will be the type of breed you’re looking for. If you know what breed of dog you want, contacting local breeders may be a good option as well.  As long as the breeder is responsible, you can likely find a puppy that is healthy and well cared for from a breeder.  Keep in mind that this will probably be a much more expensive option than adopting from a shelter or rescue.  On average, puppies obtained from a breeder cost anywhere from several hundred dollars up to several thousand.  In addition, most breeders only sell puppies.  If you’re looking for an older dog, a breeder probably won’t be the right option for you. Always ask to take a look around your breeder’s premises before buying from them.  You want to make sure your puppy was treated well and raised under good conditions before deciding to buy. Pet stores may also have a variety of dogs to choose from.  While many will be puppies, they may have some older dogs as well.  Pet stores, however, are becoming a less popular place to get a dog, with many people preferring to adopt from shelters or buy from a breeder.  Many people believe most pet stores get their puppies from puppy mills where there is abuse and ill-treatment of dogs.  Puppy mill dogs can also suffer from a number of health problems.  Do your research and trust your gut.  If you get a bad feeling from a pet store, it is best to keep looking. No matter where you get your dog, the staff or breeder should be able to give you some insight into its personality and temperament.  Ask them things like how it gets along with the other dogs, with new people, and with children. For example, if your new dog will be around new people often, a shy dog may not be the right choice for you.  A dog that is outgoing and friendly towards new people might be a better choice.
summary: Look at shelters. Contact breeders. Visit pet stores. Ask about the dog’s personality/temperament.