Round 89,891 to the nearest ten-thousands place.

The ten thousands digit is the 8 to the left edge.

You need to increase this digit because the thousands digit is greater than zero.

The answer is 90,000.

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.