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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, x1{\displaystyle x^{-1}}. This may require using the 2nd button, depending on your calculator. Your screen display should show A1{\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.

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Eating a healthy, well-balanced diet can help you keep your rheumatoid arthritis in check. A well-balanced diet, including lean proteins, whole grains, dairy, fruits, and vegetables will give you the nutrition you need to stay healthy. Some patients have luck eliminating some foods to reduce inflammation. For instance, cutting back on sugar, saturated fats, trans fats, omega-6 fatty acids, refined carbs, MSG, and alcohol may be beneficial. Cutting gluten (in bread) and casein (in dairy) back may also help. Aspartame, as well, can cause inflammation in some people. Following a vegetarian/vegan diet or a Mediterranean diet has been beneficial for some. An active lifestyle can make RA more manageable. Incorporate both aerobic exercise (like running, swimming or cycling) as well as resistance training (lifting weights or doing bodyweight exercises like planks, squats, and lunges) into your weekly routine.In general, aim for 150 minutes of moderate exercise per week. Hydrotherapy means doing special therapy exercises in water, usually in warmer water. Typically, you do hydrotherapy with a trained physiotherapist, who will guide you through slow, steady exercises. Some people find the movements help with rheumatoid arthritis. Some people add spa therapy to their hydrotherapy, meaning they use water that has salts and minerals. This treatment is especially common in Europe.

summary: Try a healthier diet to manage your body's inflammatory response. Incorporate more physical activity into your life. Use hydrotherapy for low impact exercise.

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There's a thin line between showing your interest and intruding. It's important to navigate this process with tact to avoid causing any undue emotional stress to your half-siblings or yourself. If your initial contact is met with silence, should you keep trying or throw in the towel? It may be smart to make several attempts just in case previous messages or emails were lost or went to a spam folder. However, if you don't receive a reply after a few tries, this might be a sign that your half-siblings aren't interested in meeting you. Even if they do seem interested initially, there's still a possibility that the connection could fall flat. Try not to read too much into their interest early on to prevent feeling overly disappointment when they suddenly stop returning messages or calls. You made a brave decision to reach out to your half-siblings who don't know you. You had no idea how you would be received, but you still took the initiative. It's perfectly acceptable to feel angry, hurt, or disappointed. However, don't allow these feelings to make you think any less of yourself. Keep in mind that your half-siblings don't actually know you. Therefore, their rejection is likely related to their own fear or surprise of your existence than any concerns about who you are as a person. If you have loved ones that value your presence in their lives, cherish their relationships. And, tell yourself, "It's their loss." Keep in mind that even if they are not ready for contact now, they might be ready for contact down the road. Make sure that they have your contact information and that they know the door is still open if they want to contact you later on. Despite understanding that the rejection wasn't personal, you still might be deeply affected by it. Seeing a professional during this time can help you come to terms with this loss and move on with your life. Perhaps you are an only child who just learned that you had siblings, and you'd hoped for a joyous first meeting that led to deep and lasting bonds. Or, perhaps you've just suffered the loss of a parent and needed someone to mourn with. Consult with a professional counselor who can help you sort through your feelings and cope with the rejection.
summary: Decide if you should be persistent or give up. Feel your feelings, but don't take rejection personally. Talk to a counselor.