Please help these are my last two questions! 17. Write the sum of the two vectors as an ordered pair. (7,-5) and (4, 4) A.(-1, 11) B.(3, -1) C.(11, -1) D.(-1, 3)

19. (2,7) (0,0) (3,-2) What is the resultant of the two vectors shown above? A. (9, 1) B.(1, -9) C.(-1,9) D.(5, 5)

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.