In which decade did the U.S. federal government first establish a system of agricultural price supports?

_____________ is (are) the key factor in explaining the decline in death rates in the U.S. in the late 19th and early 20th century

a. Improved sanitation b. Improved medical treatments c. Urbanization d. A more varied and nutritious diet

Which of the following statements is false?

A) An inverse relationship has a negative slope value. B) A direct relationship has a positive slope value. C) A curved line has slope values that change at every point. D) A straight line has a slope of zero.