Atripod is made from three 3x3x1/4 inch steel angles each 10 ft long. in a plan view, these angles are spaced 120 degrees apart. assuming that the ends of these angles are pin-ended, what is magnitude of allowable vertical load, f, that may be applied to tripod

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)