The amount of money spent at the gas station varies directly with the number of gallons purchased. when 11.5 gallons of gas were purchased the cost was $37.72. how much would 8 gallons of gas cost?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

X+y=-4 x-y=2 use elimination with adding and subtraction