What is the coefficient of the third term in the binomial expansion of (a b)6? 1 15 20 90

Did the universe cool off or get hotter as it expanded after the 'big bang"?

Which of the following best describes the difference between “autobiography” and “memoir”? a. autobiography is written about the author's own interpretation of events; memoir is a written interpretation of events. b. memoir covers a particular time in the writer’s life or recounts life events around one or two themes; autobiography covers the entire story of the author's life and has multiple themes. c. autobiography covers the entire story of the writer's life and has multiple themes; memoir is a shorter written work with one theme. d. autobiography covers entire story of the writer's life and has multiple themes; memoir is the writer’s random memories about past experiences.

Darwin studied two different types of tortoises on the galapagos islands. sort the characteristics based on which tortoise they describe.