Can anyone me with this i trying to pass a class

D. They made money at the expense of their workers.

Explanation:

The definition of "robber barons" is an individual that has become rich through ruthless and cruel business tactics.

They made money at the expenses of their workers.

Explanation:

c. mass = force / accellaration

step-by-step explanation:

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;