riddle: a man gets his hair cut every month and he never likes to grow his hair he says i am done with this he goes to get his hair cut and then he has not got his hair cut in 2 years how did the man not get his hair cut for 2 years.

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

Find the slope of the line passing through a pair of points

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)