Which number is not in scientific notation? 3.2 ⋅ 10–2 15 ⋅ 1020 8 ⋅ 1013 1.42 ⋅ 10–9 show your work

The one that is wrong is 15 times 10 to the 20th power because the number 15 is suppose to be changed/ decimal needs to be moved so it becomes a number between 1 and 5 which is 1.5

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.