Will give brainliest a sound wave is modeled with the equation

A) By definition, you have that the period of the y=aCos(bx) is:
 Period=2π/|b|
 b=2π/3
 Period=2π/(2π/3)
 Period=3
 b) The amplitude of y=aCos(bx) is:
 Amplitude=|a|
 Amplitude=1/4
 c) The mideline represents the horintal line that passes between the maximum and minimum points. In the equation y=aCos(bx) the mideline is:
 y=0

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