Mrs. mccain had 3 folders. each folder had the same amount of papers in it. mrs. phillips gave mrs. mccain 7 more papers she ended up with 37 papers. how many papers were in each folder?

Which of the following graphs represents the function f(x) = 2^x

I’m confused on how to work the pie charts

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)