True or false

Question 5 Not yet answered Marked out of 5.00 Flag question For any two vectors a and b, if a . b = 0 then a and b are parallel. Select one: O True O FalseQuestion 6 Not yet answered Marked out of 5.00 Flag question If a = j + k and b = i, then a x b = j - k: Select one: O True O FalseQuestion 7 Not yet answered Marked out of 5.00 Flag question a X a = 0 for any vector a in R3 . Select one: O True O FalseQuestion 8 Not yet answered Marked out of 5.00 Flag question Two vectors a = (0, 12, 3) and b = (7, -1, 6), are orthogonal: Select one: O True O False