Find the missing side length. Leave your answers as radicals in simplest form

Asinusoidal function whose frequency is 1/6pi

Your car's gasoline tank holds 18 gallons of gasoline. on a trip in canada, the tank is one-quarter full. you want to fill the tank. how many liters of gasoline are needed to fill the tank

Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.