Remove your hair from the clip and comb it straight down. Comb it smooth to make cutting easier. Working in thin sections, comb the back of your hair up and at an angle away from your head. Use the hair in the top section as a guide to trim the back. Hold the hair at the back of your head with some of the hair in the rear top section to make this part easier. Continue cutting until you have cut all the hair in the back. This cut will give you some layered length in the back. Comb out the back of your hair and make sure the length is to your liking. Check for any corners or sharp cuts by combing where the sides of your hair join the back. If you see any sharp edges cut them away until you have a smooth tapered look.

Summary: Comb out the back of your hair. Start trimming the back. Blend the rear sides.

If you are a healthy person experiencing new onset petechiae for no reason (you haven't been vomiting, straining, or doing something else that would easily explain the condition), you should see a doctor about it. Though petechiae usually go away on their own if you don't have another disease, it's best to find out if they have an underlying cause. It's especially important to take your child to the doctor if she gets petechiae for no reason that you can see, and if it covers a large part of her body. If you have an infection or disease that causes your petechiae, the best way to treat the petechiae is to try to cure the disease. Your doctor can help you decide what medication is best for your disease. In older people who's blood clotting system is naturally less effective, even minor trauma can cause significant petechiae. One way to prevent petechia if you're older is to try to avoid trauma. Of course, sometimes you can't avoid an injury, but do not take unnecessary risks. For instance, if you have trouble balancing properly, consider using a cane or walker. This may cause petechiae due to trauma, injury, or straining to disappear, but it will not treat any underlying conditions which cause petechiae. Cold can help cut down on inflammation and can help reduce future petechiae, as well. To make a cold compress, wrap an ice pack in a washcloth or towel and hold it against the area with petechiae 15 to 20 minutes or less if you can't stand it that long. Do not put an ice pack directly on your skin, as it can cause damage to your skin. You can also just use cool water on a washcloth held up to the area. The main way to get rid of petechiae is to wait for them to heal on their own. Once you treat the underlying cause, the petechiae should fade away.

Summary: Visit the doctor. Treat the underlying disease. Protect yourself if you're older. Try a cold compress. Wait for petechiae to heal.

To calculate mass from volume, you must know the density of the object. Different materials have different densities. Consider a sphere made of styrofoam, for example, and compare its weight to a sphere the same size made of iron. Iron has a much greater density and will therefore have a greater mass. You can find densities of many solid materials by looking up density tables online, in textbooks or in other industry catalogs. For example, here are the recorded densities of some solid materials: Aluminum = 2700 kg/m3 Butter = 870 kg/m3 Lead = 11,350 kg/m3 Pressed wood = 190 kg/m3 The units you used in calculating volume must match the volume units in the density measurement. If they do not, then you must convert them. All of the examples in the previous section resulted in volumes measured in cubic centimeters. However, the cited density table provides densities based on cubic meters. Because there are 100 centimeters in a meter, there are 106 cubic centimeters in a cubic meter. Divide the given densities by 106 to represent the density in units of kg/cm3. (You can do this most easily by just moving the decimal point 6 spaces to the left.) For the four sample materials, the converted densities are as follows: Aluminum = 2700 kg/m3 = 0.0027 kg/cm3 Butter = 870 kg/m3 = 0.00087 kg/cm3 Lead = 11,350 kg/m3 = 0.01135 kg/cm3 Pressed wood = 190 kg/m3 = 0.00019 kg/cm3 Recall that the formula for density is Density=MassVolume{\displaystyle { ext{Density}}={
rac { ext{Mass}}{ ext{Volume}}}}. Rearranging this to find the mass, the equation becomes DensityVolume=Mass{\displaystyle { ext{Density}}*{ ext{Volume}}={ ext{Mass}}}. Using the four sample materials, aluminum, butter, lead and pressed wood, find the mass of a sphere that has a volume of 500 cm3. Aluminum:500cm30.0027kgcm3=1.35kg{\displaystyle { ext{Aluminum}}:500{ ext{ cm}}^{3}*0.0027{
rac { ext{kg}}{{ ext{cm}}^{3}}}=1.35{ ext{ kg}}} Butter:500cm30.00087kgcm3=0.435kg{\displaystyle { ext{Butter}}:500{ ext{ cm}}^{3}*0.00087{
rac { ext{kg}}{{ ext{cm}}^{3}}}=0.435{ ext{ kg}}} Lead:500cm30.01135kgcm3=5.675kg{\displaystyle { ext{Lead}}:500{ ext{ cm}}^{3}*0.01135{
rac { ext{kg}}{{ ext{cm}}^{3}}}=5.675{ ext{ kg}}} Pressed wood:500cm30.00019kgcm3=0.095kg{\displaystyle { ext{Pressed wood}}:500{ ext{ cm}}^{3}*0.00019{
rac { ext{kg}}{{ ext{cm}}^{3}}}=0.095{ ext{ kg}}}
Summary: Find the density. Convert the units as needed. Multiply volume by density to find mass.