Over a period of 12 hours, the temperature dropped 60 degrees. What was the average change in temperature in one hour? Group of answer choices

15

-15

5

-5

What is the rotational symmetry of a wheel

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Evaluate cos2θ for cosθ = square root of 3/2