The midpoint of a line segment is the point that is located on the exact midpoint of the two endpoints. Therefore, it's the average of the two endpoints, which is the average of the two x-coordinates and the two y-coordinates. The midpoint formula can be used by adding the x-coordinates of the two endpoints and dividing the result by two and then adding the y-coordinates of the endpoints and dividing them by two. This is how you will find the average of the x and y coordinates of the endpoints. This is the formula: [(x1 + x2)/2,( y1 + y2)/2] You can't use the midpoint formula without knowing the x and y-coordinates of the endpoints. In this example, you want to find the midpoint, point O, which is between the two endpoints M (5,4) and N (3,-4). Therefore, (x1, y1) = (5, 4) and (x2, y2) = (3, -4). Note that either pair of coordinates can serve as (x1, y1) or (x2, y2)  -- since you'll just be adding the coordinates and dividing by two, it doesn't matter which pair is first. Now that you know the coordinates of the endpoints, you can plug them into the formula. Here's how you do it: [(5 + 3)/2, (4 + -4)/2] Once you've plugged the appropriate coordinates into the formula, all you have to do is the simple arithmetic that will give you the midpoint of the two line segments. Here's how you do it:  [(5 + 3)/2, (4 + -4)/2] = [(8/2), (0/2)] = (4, 0) The midpoint of the endpoints (5,4) and (3, -4) is (4,0).
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One-sentence summary -- Understand the midpoint. Learn the midpoint formula. Locate the coordinates of the endpoints. Plug the corresponding coordinates into the formula. Solve.

Q: Not surprisingly, phthalates are also found in water.  Since we cook with water and regularly drink it, it's important to find a method of removing or reducing the amount of phthalates in water.  Studies have shown that phthalates can be removed from drinking water by filtration with a water filter or filtering system.  A basic water filtration device — like a water pitcher or a twist-on for your faucet — should be able to remove most phthalates from your drinking water. However, some claim that they cannot remove all phthalates.  A nano filtration system, which is more expensive, can remove all phthalates from your drinking water. Since phthalates are in high concentrations in plastic bottles, it's important to avoid using plastic bottles when transporting water or other liquids.  Consider looking for BPA-free and phthalate-free reusable water bottles.  Many of these water bottles are now made in stainless steel which is a great alternative. Also, make sure you do not heat up plastic water bottles or put hot liquid into plastic bottles. Other options include containers made of ceramic, glass, or wood to hold and store food and water instead of plastic. If you need to buy bottled water, look for one that distinctly says phthalate-free on the label or use your own filtered water. There is a neat little trick to make sure the plastic item you're using is indeed, phthalate-free.  Make sure to review the whole package to look for these special codes.  There is a little triangle label on all plastic items.  Many times, this is found on the bottom or side of the item.  For example, it's typically listed on the bottom of plastic water bottles. If you see numbers like 3, 6, or 7 listed, this product contains phthalates.  Do not purchase this, use this or drink from it. If the numbers listed are 2, 4, or 5, then you can be certain this plastic container or bottle does not contain any BPA or phthalates. You may also want to consider using glass or porcelain food storage containers instead.  This takes the guesswork out of finding a phthalate-free container. Phthalates and even BPA that are found in plastic containers or bottles can leach into foods or beverages at higher concentrations when they're heated.  Avoid heating up these types of plastics.  Take foods out of plastic containers they come in from the store when you get home.  Repackage them into phthalate-free containers or cook them immediately. Purchase food storage containers that do not contain phthalates or use porcelain containers to store foods. Do not heat up foods in plastic tupperware or other plastic containers — don't place plastic in the microwave or oven. Take the foods out and put them on a plate to heat up. Also avoid using plastic wrap to cover and store foods.  Use aluminum foil or put foods in a phthalate-free storage container.
A: Use a water filter. Buy a stainless steel water bottle. Store food in plastic containers that have the 2, 4, or 5 recycling codes on them. Avoid heating or cooking food in plastic.

Article: Exercising your whole body to lose weight will eventually reduce fat in the facial area, too. In fact, it's very difficult to lose weight in just your face, and that's often the last place to thin out. Starting a steady exercise routine with cardio and strength training can put you on the path toward a thinner face.  Running, swimming, and biking are all great cardio activities. Plan to do one of these activities for at least 1/2 hour 4 times a week. Go to the gym and meet with a personal trainer to get acquainted with a strength training routine. Learn how to lift weights to work out all of your muscle groups. This reduces the amount of fat you store in your body and your face. Satisfy your hunger with fruits, salad and low calorie food items. If you are really serious about getting rid of your double chin, losing weight can definitely help.  Don't try anything restrictive or faddish.  Your change must be one that you can carry on for the rest of your life.  Small, consistent losses are what you should be aiming for and maintaining. Your diet should include plenty of fiber, fruits, vegetables and water.  See a nutritionist, dietician or doctor for advice and encouragement.
Question: What is a summary of what this article is about?
Do general exercise. Limit your calorie intake.