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What are some things that might be necessary to know in order to solve problems involving quadratic regression?

The year before the 10s so it was like when caveman were alive

1. 5/82.95% is better than 7/8

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.