Q3:An ocean liner experiences broad waves, called swells, with frequency of one wave every 10 seconds and a wavelength of 220 nm. What is the
speed of the liner? (20 pts.)

b would be the answer

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.