Ethan wrote the number four million, three hundred five thousand, seven hundred sixtu-two as 4,350,762.describe and correct his error.

He wrote 350 thousand instead of 305 thousand

His error was that for the 4,350,762 350 part he was supposed to write 4,355,762 because the word problem said four million, three hundred fifty five thousand, seven hunfred sixty two and not 4,350,762
 

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.