Find the value of y for a given value of x, if y varies directly with x. If y = 144 when x = 24, what is y when x = 54?
a.
324
b.
–324
c.
9
d.
–9

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.