I think what you are looking for is 5x=300 therefore x=60 so at 60cars he would start to make more.
The first one is 5c√10c/3d^3
The answer is: A, 5c√10c/3d^3
Hope this helps! :)
The answer is 5/7. That is the answer :)
The best unit to measure the capacity of water, would be gallons
