2/x +x 3 -2 = 2x -1 +x 3 -2. The first one isn't polynomial as it has a negative exponent and all exponents in a polynomial must be positive. To illustrate why the second one isn't a polynomial rewrite it a little.
The duration of an asthma attack can vary, depending on what caused it and how long the airways have been inflamed. Mild episodes may last only a few minutes; more severe ones can last from hours to days.Mild attacks can resolve spontaneously or may require medication, typically a quick-acting inhaler.More severe attacks can be shortened with appropriate treatment.ild episodes may last only a few minutes; more severe ones can last from hours to days. Mild attacks can resolve spontaneously or may require medication, typically a quick-acting inhaler. More severe attacks can be shortened with appropriate treatment.
Intermittent asthma. Asthma is considered intermittent if without treatment any of the following are true: 1  Symptoms (difficulty breathing, wheezing, chest tightness, and coughing): 2  Occur on fewer than 2 days a week. 3  Do not interfere with normal activities. 4  Nighttime symptoms occur on fewer than 2 days a month.