A command economy tends to exsit under a

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is

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)