Ship is stationary at sea. A tugboat is 21 km away at a bearing of 050°, and a yacht is 35 km from the tugboat at a bearing of 140°.
Draw a scale diagram showing the positions of the three vessels.
Use a scale of 1 : 350,000.
Measure the distance from the ship to the yacht to the nearest km

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)