Kelly received two gift cards to her favorite store. One card was worth $25 and the other was worth $40. She went shopping and used the cards to buy 3 shirts for $9 each and 2 skirts for
$17 each. How much gift card money did she have left?

She has $4 left
$40 + $25 = $65 in gift cards
9 x 3 shirts = $27
$17 x 2 skirts = $34
$65 - 27 - 34 = $4 left

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.

5because it isyeah i know it is