15. Which of the following inventions did Eli Whitney contribute to the Industrial Revolution? (
telegraphs
steam boat
airplane
cotton gin

i think the answer is c

explanation:

c. print money only as needed

the nets, boats and fishing poles are examples of determinants for catching fish. if a fisherman has a quality fishing net and fishing poles plus a high end fishing boat, then there is a big opportunity or possibility that he may catch more fish.

moreover, fish production is directly proportional to its determinants such as boat, net, fishing poles and bait. therefore, a good equipment is a determinant while fisherman’s effort is an input to his fishing skills and the output is the production made out of catching fish.