Sarah is hiking on a trail near her home. she traveled 5 miles before stopping for a break. after the break, sarah plans on increasing her speed to 3 miles per hour. which equation models the total distance, d, sarah travels after hiking for an additional h hours? a. d = 3h + 5 b. d = 3(h - 5) c. d = 3h - 5 d. d = 5h + 3

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)