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.
Birth Control Patch: This hormone-based method goes on the skin and works the same way as the pill. Each patch lasts for one week and, like the pill, users also face a 5 percent chance of pregnancy. The Cost: The same as the pillâon average, between $15 to $50 a month, or between $160 to $600 a year.irth Control Patch: This hormone-based method goes on the skin and works the same way as the pill. Each patch lasts for one week and, like the pill, users also face a 5 percent chance of pregnancy. The Cost: The same as the pillâon average, between $15 to $50 a month, or between $160 to $600 a year.