Problem: Article: Some medications, such as prednisone, can cause facial numbness. Contact your doctor promptly if you believe you're experiencing any side effects due to a medication. Tell your doctor or pharmacist about any medications you take and ask about their side effects or potential interactions. Ask them to recommend an alternative if you believe a medication is causing your lip numbness. Among other problems, a vitamin B-12 deficiency may lead to nerve damage which could cause tingling and numbness in your hands and feet, as well as muscle weakness. Ask your doctor if they recommend a blood test to diagnose a vitamin deficiency and whether you should take a supplement. You could be at risk of a vitamin B deficiency if you're over 50, a vegetarian, have had weight-loss surgery, have a condition that interferes with food absorption, or take medications such as Nexium, Prevacid, or Zantac. If you consistently experience numbness in your face, hands, or feet, along with coldness or discoloration, ask your doctor if Raynaud's disease is a possible cause. Raynaud's disease occurs when small arteries that supply blood to the skin narrow, which leads to decreased blood circulation. If your doctor suspects Raynaud's disease, they'll administer a physical exam and blood screening to make an accurate diagnosis. To manage Raynaud's disease, you should avoid cold temperatures, wear hats and gloves, avoid smoking, and try to minimize emotional stress. While a local anesthetic following a dental procedure can cause lip numbness for two or three hours, prolonged numbness could indicate a complication. If you experience persistent numbness after a dental implant, filling, wisdom tooth extraction, or other dental procedure, schedule a follow-up visit with your dentist or oral surgeon as soon as possible. Numbness after an oral procedure could indicate nerve damage or an abscess. If you're about to have a dental procedure, you can ask your dentist or oral surgeon for a medication to counteract the numbness that results after local anesthesia. OraVerse, or phentolamine mesylate, is an injectable medication that increases blood flow to soft tissues and helps to speed up the return of normal sensation. Tell your dentist or oral surgeon if you have a history of heart or blood vessel issues. It should not be used in patients with a history of cardiovascular disorders. Tingling in your lips could be a sign of both high and low blood pressure. Have your blood pressure checked regularly, or purchase a machine to check yourself at home. If you already know you have either high or low blood pressure, take your medication as prescribed, and let your doctor know if the problem persists. Many people report allergies to the red dyes used in cosmetics such as lipsticks. In addition to tingling, such an allergy may cause numbness and break-outs or bumps around the mouth. If you notice these symptoms, talk to your doctor to see if any treatment is necessary. While the area around your mouth heals, avoid wearing lipsticks or other cosmetics in the area impacted by the infection.
Summary: Ask your doctor if your medications can cause numbness. Ask if you might have a vitamin B deficiency. Talk to your doctor about Raynaud's disease. Make a follow up appointment if you've had recent dental work. Ask your dentist or oral surgeon to prescribe phentolamine. Monitor your blood pressure. Check your cosmetic dyes.

In one sentence, describe what the following article is about: In its simplest form, the DCF formula is DCF=CFn(1+r)n{\displaystyle { ext{DCF}}={
rac {CF_{n}}{(1+r)^{n}}}}. In the formula, CFn{\displaystyle CF_{n}} refers to the future value of the cash flow for year n and r represents the discount rate. For example, using the first year of the example investment from the part "Gathering Your Variables," the present value of that cash flow for $1,000 after one year, using the discount rate of 9 percent, would be represented as: DCF=$1,000(1+0.09)1{\displaystyle { ext{DCF}}={
rac {\$1,000}{(1+0.09)^{1}}}}. The discount rate must be represent as a decimal rather than by a percentage. This is done by dividing the discount rate by 100. Therefore, the 9 percent rate from above is shown as 0.09 (9100{\displaystyle 9\div 100}) in the equation. The total value of discounted cash flows for an investment is calculated as the present values of each cash flow. So, the other cash flows must be added to the calculation in the same method as the first one. For the previous example, we would add the $2,000 and $3,000 payments at the end of the second and third years to the equation. In total, this gives: DCF=$1,000(1+0.09)1+$2,000(1+0.09)2+$3,000(1+0.09)3{\displaystyle { ext{DCF}}={
rac {\$1,000}{(1+0.09)^{1}}}+{
rac {\$2,000}{(1+0.09)^{2}}}+{
rac {\$3,000}{(1+0.09)^{3}}}} Solve your equation to get your total discounted value. The result will be the present value of your future cash flows. Start by adding the discounted rate to the 1 within parentheses: This gives DCF=$1,000(1.09)1+$2,000(1.09)2+$3,000(1.09)3{\displaystyle { ext{DCF}}={
rac {\$1,000}{(1.09)^{1}}}+{
rac {\$2,000}{(1.09)^{2}}}+{
rac {\$3,000}{(1.09)^{3}}}} From there, calculate the exponent. This is done by raising the "1.09" in parentheses to the power above it (1,2, or 3). Solve this by either typing "[lower value]^[exponent]" into Google or using the exponent button, xy{\displaystyle x^{y}} on a calculator. After solving the exponent, the equation will be: DCF=$1,0001.09+$2,0001.1881+$3,0001.295029{\displaystyle { ext{DCF}}={
rac {\$1,000}{1.09}}+{
rac {\$2,000}{1.1881}}+{
rac {\$3,000}{1.295029}}} Next, divide each cash flow by the number underneath it. This yields: DCF=$917.43+$1,683.36+$2,316.55{\displaystyle { ext{DCF}}=\$917.43+\$1,683.36+\$2,316.55} Finally, add up the present values to get the total, which is DCF=$4,917.34{\displaystyle { ext{DCF}}=\$4,917.34}. In some cases it may be necessary to change the discount rate used to account for changes to expectations, risk, or taxes. For example, businesses analyzing a project might add a risk premium on to the discount rate used to discount the cash flows from a risky project. This artificially lowers the returns to account for risk. The same might be done for a very long time window between the present and the future cash flows to account for uncertainty. Discount rates may be converted to real rates (rather than nominal rates) by removing inflation from the discount rate. A spreadsheet program, such as Excel, has functions that can help with these calculations.
Summary:
Set up your equation. Add up all discounted cash flows. Arrive at the discounted value. Adjust your discount rate.