What jobs did free African Americans have?

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.

The ability to accurately gauge the distance of the coffee cup on your desk as you reach for it is called:

During the 1500s,most rulers supported established a. political systems. d. none of the above b. churches c. freedom of speech