They drove 9.4 hours on friday,8 hours on saturday, and 12.25 hours on sunday. how many total hours did they drive ?

21.65 hours in total 

9.4 + 8 + 12.25 = 29.65

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.

32.10 is the correct answer