Abeverage is made by mixing 2 parts of water with 3 parts of fruit juice. how many parts of water are mixed with 1 part of fruit juice?
the answer should be a fraction

2/3 = x/1...2 parts water to 3 parts juice = x parts water to 1 part juice
cross multiply
(3)(x) = (2)(1)
3x = 2
x = 2/3 parts water are needed for 1 part juice

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.