Winston, an architect, is adding a stairway to a parking garage. The stairway must be 3 meters high, and he has enough room on the ground for the staircase to reach the ground 9 meters away, which will satisfy local building codes. To the nearest tenth, how long will the stair stringer be?

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)