Does anyone know how to do this ? I need help

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

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)