Can I record silence and blast it at full volume to make the whole room silent

With #! i’ve tried to figure it out but i can’t.

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

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9