okay......5th grader.....
So look 300 pounds is 1 elephant. So ifar there are 12 elephants 300×12=3,600 pounds. But that's not all there were 5 days in which this took place. So 3,600×5= 18,000.
ANSWER IS 18,000
EXPRESSION= 5 (300×12)
5 (300×12) would be it because parentheses always go first so when u multiply 300 and 12 you will get a product to then multiply it by 5 which is 18,000. Your welcome.