Problem: Article: Most cases of croup are able to be treated at home, but if your child is still sick after 48 hours, has a stridor, or if their symptoms worsen, call your doctor. Most cases of croup are caused by a virus, so antibiotics will not be effective. However, your doctor may be able to prescribe medicines to ease your child's breathing and treat their symptoms. Ask whether a steroid (glucocorticoid) would be beneficial for your child. These steroids help to reduce inflammation in the airways and make it easier to breathe. Inquire if a nebulizer treatment (breathing treatment) would be beneficial. A nebulizer vaporizes the medicine which the child then breathes in through a mask. This is a common treatment for children with croup. These tests would help to confirm the diagnosis of croup and to make sure your child doesn't have another illness with similar symptoms. These are rarely necessary, but if your child's condition is worsening, discuss these tests with your doctor. Usually, using steroids or other medications to ease breathing and treat the cough is sufficient to help your child begin to feel better. Croup will usually resolve on its own, so treating the symptoms is enough. However, blood tests and x-rays are an option if your child does not seem to be getting better. If your child is dehydrated or has very labored breathing, they need immediate medical help. Signs of dehydration include reduced urination, few or no tears when crying, a dry or sticky mouth, or sunken eyes. If your child has these signs, or if they are having extreme difficulty breathing, take them to the emergency room or call for paramedics. Seek immediate medical attention if your child has bluish tinges to lips or fingernails, cannot swallow due to a swollen throat, or if they show signs of retraction (their neck or chest muscles pull in when they breathe).
Summary: Visit a doctor if the symptoms lasts longer than 48 hours. Ask your doctor if blood tests or x-rays are necessary. Know when to seek immediate medical attention.

INPUT ARTICLE: Article: If your baby has ringworm, he made have round rash spots on his skin. These rashes will be red or pink in color and have scaly and raised borders. The center of the rash may also be scaly or it may be smooth. The rash spots usually are between half an inch to an inch; however, they will slowly grow larger. You may notice that your baby is itching the areas where the rash is. Ringworm may be confused with some kinds of eczema in infants. Ringworm is more common in children in school than in babies. If your baby has ringworm, the first thing you should do is take her to the pediatrician. The doctor can examine the infected areas and be able to diagnose the ringworm by sight. They can tell you if the rash is in fact ringworm or if it is another condition. You should make sure to take your baby to the doctor if the ringworm is on the scalp. Never try to treat your baby's ringworm at home first before taking her to the doctor. You might misdiagnose the ringworm or not use a remedy strong enough to get rid of it, which could cause the condition to worsen. Not all medicines are approved for infants. Your doctor will recommend those approved for your baby. Some cases of ringworm may present cause for immediate medical treatment. Seek medical treatment if your baby's ringworm has any pus coming from the rash or redness around the rash, the rash is still spreading after a week of treatment, the rash has persisted for more than four weeks, your child has additional spots popping up on her body, or your child's condition worsens. When you go to the doctor, you should ask him questions. Ask him if the rash is ringworm or something else. Take notes on what the doctor tells you about your baby's infection. Ask for clarification on anything that doesn't make sense to you. If your doctor doesn't tell you which cream to use, you should ask him to recommend or prescribe an antifungal cream. Make sure to write down your doctor's instructions for treating your baby carefully so you can treat it correctly at home.

SUMMARY: Recognize the symptoms of ringworm. Visit the doctor. Ask questions.

In one sentence, describe what the following article is about: You can perform certain operations on a matrix to transform it while keeping it equivalent to the original. These are called elementary operations. To solve a 2x3 matrix, for example, you use elementary row operations to transform the matrix into a triangular one. Elementary operations include: swapping two rows. multiplying a row by a number different from zero. multiplying one row and then adding to another row. You want to produce zero in your second row, so multiply in a way that lets you do that. For example, say you have a matrix that looks like this:You can keep the first row and use it to produce zero in the second row. To do that, first multiply the second row by two, as follows: In order to get to zero for the first row, you may need to multiply again, using the same principle. In the example above, multiply the second row by -1, as follows:When you complete the multiplication, your new matrix looks like this: Next, add the first and second rows to produce zero in the first column of the second row. In the example above, add the two rows together as follows: At this point, you have a triangular matrix. You can use that matrix to get a new linear system. The first column corresponds to the unknown x, and the second column corresponds to the unknown y. The third column corresponds to the free member of an equation. For the example above, your new system would therefore look like this: Using your new system, determine which variable can be determined easily, and solve for it. In the example above, you'll want to "backsolve" moving from the last equation to the first when solving for your unknowns. The second equation gives you an easy solution for y; since the x has been removed, you can see that y = 2. Once you've determined one of the variables, you can substitute its value into the other equation to solve for the other variable. In the example above, replace the y with a 2 in the first equation to solve for x as follows:
Summary:
Understand elementary operations. Multiply the second row by a non-zero number. Multiply again. Add the first row to the second row. Write down the new linear system for the triangular matrix. Solve for one of the variables. Substitute to solve for the second variable.