(a square +b square -ab) multiplied by 2 a square b square

Aformual for 8 bottles of window cleaner calls for 6 cups of rubbing to customers alcohol 2 1/4 gallons of water and 1 1/2 cups of ammonia alcohol would the forula call if a factory made 1,280 bottles for stores to sell to customers

Which representation has a constant of variation of -2.5

Three times the sum of a number and seven is negative thirty-six. what is the number?