On tuesday, you sold $2,889.32 in regular gas; on wednesday, you sold $2,996.42, and on thursday, you sold $3,435.53. if the price of regular gas was (to the nearest penny) $1.19 per gallon all week, how many gallons did you sell?

7833 gallons. add all three days and divide by the price

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.