You use a sine function to model the percentage of the moon’s face that is lit by the sun every night. at full moon, all of the moon’s face is lit (100%). at new moon, none of the moon’s face is lit (0%). the output of your function expresses percentages as decimals. for example, 5% = 0.05. what is the amplitude of your sine function? 0.1 0.5 1.0 2.0