Which fraction is bigger 11/15, 14/27

Which best explains why this triangle is or is not a right triangle?

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Find the value of x that will make l ll m