Rick and Clara each collect baseball cards. Rick collects 3 cards per day, and Clara collects 2 cards pe day. The two started with a combined total of 40 cards.
Which equation(s) model(s) the situation if d is the number of days, and t is the total number of cards
between Rick and Clara?
Select ALL that apply.
A
50+ 40 = 1
B
40+ (3 x d) + (2 x d) =
С
(5 xd) + (40 x d) =
D
t = 40 - 30 - 20
E
(20) + (3d) + 40 =
F F
40 =23

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)