a small airplane has a speed of 250 mph in still air. The plane heads directly north and encounters a 45 mph wind blowing due west find the resulting speed and direction of the flight vector. Please explain if possible i really need help understanding this!

If you are dealt 4 cards from a shuffled deck of 52? cards, find the probability that all 4 cards are diamondsdiamonds.

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

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)