One of the numbers (-12) are negative and can be found on the left side of the number line.While 9 is positive and can be found on the right siode of the numberline.
4 quarts is 1 gallon 6 pints is 0.75 gallons 4 cups is 0.25 gallons if you add all of those you would get 2 gallons so she would need 1 more gallon of lemonade
