On monday, the mars rover traveled 330 cm. on tuesday, it traveled 180 cm. if the rover stopped every 15 cm to recharge, how many more times did it need to recharge on monday than on tuesday?

The answer is 10 more times.

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.