16 Look at this pattern
Shape 1
Shape 2
Shape 3
a) Draw the next shape
b) write the formula to work out the
number of squares in shape n
c) how many squares would there be in
shape 50?
d) which shape has 64 squares in it?

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)