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.
There are two types of nicotine patches: 1  16-hour patches are for light-to-average smokers. 2  24-hour patches provide a more constant dose of nicotine to help you resist cigarette smoking throughout the day and night, but the chance of side effects is higher.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.