What is 50 percent of 84

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

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

What could explain what happened when the time was equal to 120 minutes