Leah bought stamps at the post office. Some of the stamps had a snowflake design, some had a truck design, and some had a rose design. Leah bought 19 snowflake stamps. She bought 5 more truck stamps than snowflake stamps, and 20 fewer rose stamps than truck stamps. How many stamps did Leah buy in all?

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.

The answer is, the streetlight is 18 inches tall.