Regina spent $45.50 over 6 1/2 months on music downloads. If she spent the same amount each month, how much money did Regina spend per month on music downloads? Choose the equation that can be used to represent the situation.

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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.