Answer each question don't need to show your work. Thanks

Question 20 (1 point) How many critical points does the function fx) = x - x+ 1 have? (a) 1 O b) 3 O c) 2 OdloQuestion 21 (1 point) If P = [5, -3] and ? = [1. 4], find \\ - 591. O a) 529 b) [ 4, - 7] O c) 23 O d) [o, -23]\fQuestion 25 (1 point) |#|= 3, |vl=4, and the angle between # and v (when placed tail-to-tail) is 90. Find |17 - V1. O a) 12 Ob) - 1 O c) 25 O d) 5