You are working as a caterer and need 20 gallons of lemonade for an upcoming event. the bottles of lemonade you are purchasing are in liters

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8