Jason has $90 to spend. he wants to purchase a bag for $30, one eraser for $10, and three pencils. each pencil cost the same price. this will use up all of jason's money. determine the price of a pencil.

$16.67 would be the price of each pencil.  You divide 50 by 3 and get 16.6 repeating so you round it up to 16.67

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.