David was training for a 5k running race. each day of the week he run 65 minutes. how many minutes does he run in 4 weeks

Number of weeks times minutes per week=total minutes
4 times 65=260 minutes in 4 weeks

If he runs 65 minutes in a week and we runs for 4 weeks then it would be solved as
65 times 4 equals 260 minutes total

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.