Keith had one hundred eleven dollars to spend on six books. After buying them he had fifteen dollars. How much did each book cost?

Need ! easy 6th grade work! i will put as much points as i can! you so much! i’m learning this in math and it’s soo

What function has a range {yly< 5}? question on picture above^

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)