Astore had a number of chairs in stock at the beginning of the week. during the week, 66 chairs were sold, leaving the store with 15 chairs. how many chairs did the store have at the beginning of the week?

The store had 81 chairs before they sold 66 of them

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.

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