A set of stairs is being built as shown. What is the height of the stair?
3 triangles form stairs. Each triangle has a side length of 9 inches and hypotenuse of 15 inches.
The stair is___inches high.

Do social recommendations increase ad effectiveness? a study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. data were collected on whether the viewer could correctly recall the brand being advertised after seeing the video. the results are given below. correctly recalled the brandarrival 409153browsing20484b. conduct the hypothesis test, using the 0.025 level of significance. what is the value of the test statistic? χ2stat=what is the p-value? p-value=is this value significant atα=0.025?

Solve 2 - 3 cos x = 5 + 3 cos x for 0° ≤ x ≤ 180° a. 150° b. 30° c. 60° d. 120°

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?