In which expression should the exponents be multiplied? 1. one fifth to the 2nd times one fifth to the 6th 2. 9 to the 3rd over 9 to the 4th 3. 7 to the third power multiplied by 7 to the 8th power 4. (two to the 6th power) negative exponent 5

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)