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.
Coughs are a common complaint seen by doctors, and their duration helps determine the likely cause. A cough that lasts less than three weeks is defined as acute, sub-acute cough lasts three to eight weeks, and chronic cough lasts more than eight weeks. Because your boyfriend's cough is in the sub-acute group, the most likely causes include post-nasal drip, acid reflux, persistent infection, and asthma.