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.
Time Frame. Symptoms can be intense and severe, or they can be mild--with the person not even knowing what is happening. How long the symptoms last can vary from person to person. In general, heart attack symptoms last at least 15 to 20 minutes and can go on for several hours.The only way to be certain if you are having a heart attack is to be properly tested.ommon heart attack symptoms are pain, pressure or heaviness in the chest, arm, neck, jaw or back pain, shortness of breath, sweating, nausea, lightheadedness or dizziness.