Angel runs 4 miles per day. what is the relationship between the number of days and how many miles he has run?
a. cannot be determined
b. proportional
c. non-proportional
d. ratio

The answer is D. Ratio. When ever you see “per” another number it’s a ratio.

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.