The plus-minus sign (Â±) is a mathematical symbol with multiple meanings. 1  In mathematics, it generally indicates a choice of exactly two possible values, one of which is the negation of the other. In engineering the sign indicates the tolerance, which is the range of values that are considered to be acceptable, safe, or which comply with some standard, or with a contract. 2  In chemistry the sign is used to indicate a racemic mixture.
In order for this to be an option, homeowners should have some spare carpet available for the professional to use. It is vital to have a matching carpet sample, or the patch won't be an effective repair. The average cost of a small patch repair, when done in the home, should run between $178 and $218. In some cases, a small patch simply won't be able to cover up the affected area. Whether there is a stain caused by a pet or a snag turned into an unsightly hole, a larger repair may be necessary.
Do not smoke while you're using a patch, as that can overload your system with nicotine and cause nicotine poisoning, which includes many of the side effects noted above. Used correctly, the nicotine patch can be an important part of a successful plan to quit smoking. 1  Basics. 2  Psychological Approaches.3  Management.he nicotine patch is available at a wide variety of stores and has an average cost per day of $4. There are two types of nicotine patches: 1  16-hour patches are for light-to-average smokers. 2  They are less likely to cause side effects, but donât help with morning cigarette cravings.