A sparkling-water distributer wants to make up to 200 gal of sparkling water to sell for $5.00 per gallon. She wishes to mix three grades of water selling for $10.00, $1.00 and $4.50 per gallon, respectively. She must use twice as much of the $4.50 water as the $1.00 water. How many gallons of each should she use?

The answer would be the second choice : )

than do 23.50 times 18 and then divide your answer by 100 than you will get x.

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.