A car burns 0.85 gallons of gas per hour when idling . which conversion factors would be useful to solve this problem?

Solve the system of equations. y= 2x y= x^2 - 15

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years