Why is it a smart idea to provide additional sources, like links and phone numbers, when responding to a message?.

Why do you think electric energy for households is generally supplied by power plants instead of by an electric generator at home.

What does the first stage of a multistage rocket do?

On a test the graders have a mean of 77 and a standard deviation of 8. if we can approximate the distribution of these graders by a number distribution what percent of the students. a) scores higher than 77? b) should pass the test (grades > 60)? c) should fail the test (grades < 60)?