John worked five less than twice as many hours as jane did how many hours did each work if together they worked 97 hours

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)

Are you guys willing to me with these last 8 questions on my homework for math reply to this question that i posted

Solve the system of equations. x=-2y+1 and x+2y=9. show work