Diana and some friends want to go to the movies, if they have to pay $15 to get in the movie theater and then $2 for each bag of popcorn that they buy(p), then how many bags of popcorn did they buy if they spent $45 all together?

Write the equations in logarithmic form 10^3=1,000

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)

Why is causation so much more difficult to prove than correlation?