Last week Clay spent 3/4 of an hour cleaning weeds out of the front flower bed before spending 7/9 of an hour trimming the hedges. How much time did Clay spend working in his yard?

Whose mistake? can you give more details to what the question is asking?

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.