Please help me the picture is above, I’ll mark as brainliest.

Which expression is rational? 6. , square root two, square root 14, square root 49

What is the scale factor of two similar pyramids with volumes of 64 cubic feet and 8 cubic feet

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)