Jessica and Emily each improved their yards by planting daylilies and ivy. They bought their supplies from the same store. Jessica spent $196 on 14 daylilies and 14 pots of ivy. Emily spent $114 on 7 daylilies and 9 pots of ivy. Find the cost of one dayliliy and the cost of one pot of ivy.

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)