4. The amount of paper needed to cover a box top in the shape of a trapezoid is 198 cm². If the height of the box top is 18 cm and the length of one of the bases is 10 cm, find the length of the other
base.

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)