At a college, 65% of courses have final exams and 46% of courses require research papers. Suppose that 31% of courses have a research paper and a final exam. Find the probability that a course has a final exam or a research paper. Find the probability that a person does NOT have both type O blood and the Rh− factor.

Matt and brian were solving a system of equations. they both noticed that the two lines had the same slope. brian said that because each line in the system had the same slope, the two lines had to be parallel, which meant the solution to the system was "no solution" matt disagreed, and said they should also look at the y-intercepts before determining how many solutions there were. who is correct?

Plz heeeeeeelp plz give me the answer

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.