A customer at a store paid $130 for 5 pillows and 2 comforters. At the same store a second
customer paid $20 more than the first customer
for 3 pillows and 1 comforter. The price of each
pillow is the same, and the price or each comforter
is the same.
Which system of equations can be used to find the
price I dollars of each pillow, x. and each
comforter, y?

15 points ! ~ see if you know the answer to both you!

Solve for x in the equation x2 - 12x + 36 = 90. x= 6+3x/10 x=6+2/7 x= 12+3/22 x = 12+3/10

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)