A ladder is lear, ing against a building. The base of the ladder is 7 meters from the base of the building. If the ladder is 20 meters tall, what is the angle the ladder makes
with the building? Round your answer to the nearest hundredth of a degree.

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)