A 27-foot ladder leans against a building. It is 14 feet from the base of the building. What is the measure of the angle formed by the ladder and the building rounded to the nearest tenth?

At which value in the domain does f(x) =0?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Two researchers are attempting to create a new psychotherapy protocol that more reduces panic attacks. they believe that they have succeeded and are now in the clinical trial period of their protocol's development. they are working with several cohort groups, some of which have been through the new protocol, while others have done the standard protocol currently recommended. if these researchers are interested in evaluating the difference in the percentage of test subjects who successfully decreased their panic attacks in 2 months on the new protocol versus the percentage of test subjects who successfully decreased their panic attacks in 2 months with the traditional protocol, which of the following statistical tests would be most appropriate? a. analysis of variance (anova) b. correlation c. chi-square test d. paired t-test e. independent t-test