Americans when compared to other countries have higher rates of

"Students who use mental imagery to study for an exam will do the same as those who do not." This sentence is an example of

a. a research idea. b. a research problem. c. a scientific hypothesis. d. a null hypothesis.

What explains the decision to eventually eliminate anti-slavery language in the new constitution?

a. anti-slavery sentiment b. Connecticut Compromise c. fear of splintering the convention d. slave states had more votes