The basic shipping charge is $10 for the first item via USPS, and $7 more for each additional item. Write an equation that could be used to calculate the shipping charge. What is the cost of
shipping 67 items?

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.

Re-do the question and enter the picture