Hey! If y'all could look at the pic and help I would appreciate it a Lot!

He concluded that a heavier object dropped from the same height as a lighter object will land

What is the simplified form of square root of 400 to the 100th power ?

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)