For a normal curve, what percentage of values falls beyond two standard deviations from the mean? A. 5.55% B. 4.55% C. 10.55% D. 12.55% E. 13.11%

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The ratios 3: 9, 4: 12, 5: 15, and 6: 18 are a pattern of equivalent ratios in the ratio table. which is another ratio in this pattern?

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?