In the context of problem solving, the most frequently used problem-solving heuristic is:

means-end analysis

Explanation:

Means-end analysis is a term used to describe a problem solving method that sequentially joins, in a value hierarchy, the attributes of a problem, the consequences of that problem, and the ways to solve it. This is all done by testing ways to solve a problem, done over and over until the solution is established. This method is the most commonly applied problem solving heuristic.

who were inferior and deserved to be nothing but workers and servers because the bible at that time did not say anything about black men being normal or equal.

answer; utilitarian;