a jogger ran 4 miles, decreased her speed by 1 mile per hour, and then ran another 5 miles. if her total jogging time was 2 2/3 hours, find her speed for each part of her run.

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.