1 The brightness of the star MIRA over time is given by the equation y 2sin x 6 where x represents time and y represents brightness What is the period of this function in radian measure 2 The voltage produced by an electric circuit is modeled by a cosine function The maximum voltage is 200 volts and there are 45 cycles every second Write an equation that best represents the value of the voltage as it flows through the electric wires where t is time in seconds 3 Ocean tides follow a repeating pattern over time with the amount of time between each low and high tide remaining relatively constant The graph below models the water level with respect to time Write a function that models the water level f t in inches above or below the average sea level as a function of the time measured in t hours since low tide Determine the 20 10 10 1 1 20 9 10 11 12 13 15 1 16