At a college, 67% of courses have final exams and 42% of courses require research papers. Suppose that 28% of courses have a research paper and a final exam. What is the probability that a course has a research paper or final exam?​

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In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.

What is another way name for bd? cf, bd, cf, be