In a normal distribution, what percentage of the data falls within 3 standard deviations of the mean?

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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?