In one sentence, describe what the following article is about: Painting can get a little messy. If you’re working in an area where wet paint may be an issue, set up protections before starting. You can place painter’s tape over areas you wish to protect. Set a plastic tarp on the ground to protect flooring.  Painter’s tape works very well when you’re painting near a wall, for instance. You may have a pine wall or trim. Lay strips of tape around the pine for protection. Painter’s tape and tarp are available online and at most hardware stores. These locations also have anything else you may need to paint pine. There are several hazards to be aware of during the painting process. If you’re wearing a dust mask, you can protect yourself from wood dust, paint chips, and paint fumes. If possible, work outdoors or in an otherwise ventilated area. Open up nearby doors and windows. Keep other people and pets out of the area until you’re done working. If you’re working with a piece of pine that has been painted in the past, check it over for loose paint chips or cracks. Then, hold the edge of the knife roughly parallel to the wood. Push down with a gentle but firm amount of pressure as you move the knife across it. You do not have to remove any paint that isn’t cracked or loose.  Work in different directions to get the knife underneath the paint. It can be difficult to remove and often requires a couple of attempts. Be careful when scraping paint. You could gouge the wood if you push too hard against it. Damaged spots have to be filled in with something solid, such as a paintable wood filler. To apply it, pick some of it up with the tip of a putty knife. Press it as deep as you can into the damaged portion of the wood. Keep spreading more filler until the repaired spot  is slightly higher than the surrounding wood.  The filler will get worn down while you’re sanding, so make sure you add a little more of it than you think you need. If you don’t use enough, it won’t blend in well with the rest of the wood. You can also use some other types of paintable filler. For example, mix resin for a stronger way to fill holes more than 1⁄8 in (0.32 cm) deep. It is made by mixing equal parts resin and hardener. To make sanding easier, make use of an electric sander. It can be a very slow process if you do it by hand, especially on larger projects. Work along the grain, or in the direction of the visible wood fibers you can see on each pine board.  You can sand by hand if you don’t have an electric sander. Get sandpaper or a sanding block. Press it against the wood with firm but consistent pressure. Always sand in the direction of the grain. If you go against the grain, you will end up tearing the wood fibers, creating very noticeable scratches. Move the tack cloth along the grain, starting at the top of the wood. Since it is sticky, it will pick up all the loose sawdust and other debris. Rub down the entire piece of pine and then check it for anything you missed. If you don’t have a tack cloth, scrub the wood with a microfiber cloth lightly dampened in lukewarm water. Use an electric sander again to make the process much quicker. Go back over the entire piece of pine, following along the grain. Make sure you have sanded the entire area you wish to paint. Sanding roughs up the wood so paint adheres to it better.  You can sand the wood by hand if you wish. You may need to in order to treat spaces that are hard to reach with an electric sander. Sandpaper grits above 120 are finer and can also be used. Lower-grit sandpaper is coarser and could damage the finish at this point. Since you sanded the wood a second time, it will have more sawdust on it. Take care of it so it doesn’t affect the finish later. Make sure the wood looks completely clean before attempting to paint it.  Any debris left on the wood could prevent the paint from adhering correctly, so take plenty of time to clean it. Try to paint it as soon as possible before more dust has a chance to settle on it. If you can’t paint the wood right away, store it, then wipe it clean again right before painting it.
Summary: Protect areas around the pine with a tarp and painter’s tape. Put on a dust mask before working on the pine. Use a putty knife to remove loose paint if the pine has any. Apply a wood filler to any holes or cracks in the wood. Use 100-grit sandpaper to rough up the surface of the pine. Wipe the pine clean with a tack cloth. Sand the wood a second time with 120-grit sandpaper to smooth out the wood. Clean off any remaining dust with a tack cloth.

A relation is just a set of x and y coordinates. Let's say you're working with the following coordinates: {(1, 3), (2, 4), (5, 7)} They are: 1, 2, 5. D = {1, 2, 5} For a relation to be a function, every time you put in one numerical x coordinate, you should get the same y coordinate. So, if you put in 3 for x, you should always get 6 for y, and so on. The following relation is not a function because you get two different values of "y" for each value of "x": {(1, 4),(3, 5),(1, 5)} is not a function because X coordinate (1) has two different corresponding (4) and (5).
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One-sentence summary -- Write down the relation. Write down the x coordinates. State the domain. Make sure the relation is a function.

Problem: Article: Storing your mop while it is still wet encourages mold and bacteria to grow. Let your mop head dry completely before you store it so that your mop head will last longer. Dry mops, sponge mops, and other mops with flat heads should be stored with the head up. This keeps their heads off the floor and away from dust and debris while not in use. It also helps them better maintain their shape. Traditional wet mops should be stored in a way that allows their strings or strips to hang down naturally. If possible, the best way to do this is to hang the head off of a hook or rack on the wall, separate from the handle. If you cannot store your wet mop head separate from the handle, store the mop with the head up. This may cause some misshaping, but it is more sanitary and will help your mop last longer. To help avoid mold and mildew growing on your mop head, keep it in a dry place. A closet or another indoor space generally works just fine. Garages that aren’t temperature-controlled and laundry rooms aren’t always the best idea, though, as these can get humid. Exactly when you need to replace your mop will depend upon how often you use it and what you use it for. In general, though, a mop head will last about three months. If your mop smells even after disinfecting or if it has continued problems with mold growth, replace it immediately.
Summary:
Let your mop dry completely before storing it. Store dry mops and sponge mops with their heads up. Store string and strip wet mop heads separate from the handle. Keep your mop in a dry place. Replace your mop as necessary.