In one sentence, describe what the following article is about: To calculate marginal cost, you need to know the total cost to produce one unit of whatever product or service you sell. Fixed costs should stay the same throughout your cost analysis, so you need to find the output level at which you would have to increase those fixed expenses. For example, if you own a cupcake bakery, your ovens are a fixed expense. If your ovens are capable of baking 1,000 cupcakes a day, then 1,000 would be the maximum quantity of cupcakes you would consider for your marginal cost analysis. If you produced more than 1,000 cupcakes, your fixed costs would change because you would have to buy an additional oven. You may want to calculate the marginal cost for each individual unit of the product or service you sell. However, this is generally only helpful if you produce relatively few products or services in a day. Otherwise, you probably want to look at the change in quantity as a factor of 10, 50, or even 100. For example, suppose you run a spa that gives between 3 and 5 massages a day. You want to know the marginal cost of scheduling one additional massage. In this case, it makes sense for your interval to be one. If you produce products, you may want to look at larger changes in quantity. For example, if your company produces 500 widgets a day, you might want to consider the marginal cost of producing 100 more, then 200 more, and so on. Each interval constitutes a production run. To find the change in quantity, you simply subtract the old quantity from the new quantity. For example, if your company produces 500 widgets a day and you want to look at the marginal cost of producing 600 widgets a day, your change in quantity would be 100.
Summary: Find the output level at which your fixed costs would change. Decide what interval you want to evaluate. Deduct the number of units in the first production run from the number of units in the second production run.

If you want the guy to ask you out, then one thing you can do is to bring up some things you both like. That way, he has more of an opportunity to ask you for your number because he can think of an excuse to do it. Here are some ways you can mention the things you like in order to get the guy to feel more comfortable about asking for your number: Mention a movie that's playing in theaters. If you think it's something you both may like, he might ask you to go with him. Bring up a band you both like. If you're both talking about music, you can use it as an opportunity to mention a band that's playing in town. Saying, "Have you heard of Animal Collective? They're actually coming to town at the end of the month" can plant a seed in the guy's mind. Talk sports. If you're the kind of girl who likes sports, then you can say something like, "I've been watching the As for a few years now, but I still haven't gone to a game." This can make it easier for the guy to ask you to come along. Bring up your favorite foods. Maybe you both love Mexican food or Ethiopian food. If a new restaurant opened in town, or if you've been dying to try the food at a certain place, bring it up and see if he bites. Bringing up something you're doing in the near future can make the guy more likely to ask for your number because he'd like to come along. Find a way to casually bring up something you're doing in the middle of the conversation and see if he expresses an interest in joining. If he does, then he'll have almost no choice but to ask for your phone number. Here are some things you can say: Mention a party you're going to that weekend. He may want to come along. Talk about an awesome class you're taking, whether it's a kickboxing or rock climbing class. He may want to try it. If you and a bunch of your mutual friends are going on a weekend trip, talk about it casually and see if he wants to come along. You don't have to say, "Please please ask for my phone number!" for him to get the picture. If you're spending a bit of time together, whether you're just hanging out after school or taking a long lunch together during work, you can make some subtle comments that could lead him to want to spend even more time with you. Here are some things you can say: "I always have so much fun talking to you." "This has been such a crazy conversation. I can't remember the last time I laughed so hard." "It's always really easy to talk to you." You can also find a way to make it pretty clear that you don't have a boyfriend. He may be afraid to ask for your number because he may think you're dating someone else. Though you shouldn't be rude and text your friends or answer the phone while you're talking, at some point in the conversation, if you want to hint that you want him to ask for your number, you should take out your phone for a second or two. Maybe you'll do it to see who is texting you. Maybe you'll take out your phone to show him a picture of your cat or something else you were talking about. Just pulling out your phone for a second will make him realize that hey, you're a cute girl with a phone, and that he should probably get your number. Make sure you don't flash your phone for long, though. He may think you're not that interested in him if you do this. If you want the guy to ask for your number, then you can't linger around until you both have nothing to say, or he won't want to hang out again. Instead, wait until the conversation is really going somewhere, and before there's a lull, excuse yourself, saying that you really have to go but that you loved talking to him. If it works, then he'll say something like, "I'd love to pick up this conversation soon" or "I'd like to spend more time with you." If the guy gets the message, he will ask for your digits. And if he doesn't, have patience -- it sometimes takes time for a guy to work up the courage to ask for your number. And hey, if you're pretty sure that the guy likes you but he's proven too shy to ask for your number, what's stopping you from taking the initiative and asking for his digits?
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One-sentence summary -- Mention your shared interests. Talk about your plans. Casually let him know you like hanging out with him. Pull out your phone. Leave when the conversation is getting good.

Problem: Article: Some sticky substances, like hot glue or gum, become very brittle when they are frozen. Put the fabric in the freezer until the sticky substance is completely frozen. This method works better with gum and glue-like substances rather than stickers or sticky substances that have seeped into the fabric. You can put the garment into a freezer safe plastic bag as long as the sticky substance does not touch the bag. You can freeze any type of fabric without damaging it. Once the sticky substance is frozen, remove the garment from the freezer. Immediately begin to scrape the substance off with a flat butter knife or an old credit card. The frozen glue should pop off and detach from the fabric. You may be able to use your fingernails to pry off the gum as well. If freezing the sticky substance didn't remove all of the residue, use another method to remove the remaining stain. Try using heat or an adhesive removal product to remove the remaining stickiness. Once the stain is fully removed, you can wash the garment.
Summary:
Place the fabric in a freezer. Scrape off the frozen substance. Use another method, if necessary.