Which of the following quadratic functions has a graph that opens downward? A. y= 3/2x^2 -3x+15 B. y= 5/2x-3x^2 C. y= 3x^2-x-1 D. y= -(2x^2-1)

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

Mason and christian go to the movie theater and purchase refreshments for their friends. mason spends a total of $45.75 on 3 bags of popcorn and 6 drinks. christian spends a total of $71.50 on 6 bags of popcorn and 4 drinks. write a system of equations that can be used to find the price of one bag of popcorn and the price of one drink. using these equations, determine and state the price of a drink, to the nearest cent.

15 liters is approximately how many gallons