 In this video, we discussed the solution to question number one for practice exam number three for math 1060 We're given a vector v which is given an algebraic form the Horizontal component is three and the vertical component is negative four negative four and we're asked to compute the magnitude of the vector So because the components of a vector satisfy the Pythagorean relationship with the magnitude We can use the Pythagorean relationship to compute the magnitude here in particular We're going to get that the magnitude of the vector v is the square root of the horizontal component squared plus the Vertical component squared we end up with a square of 9 plus 16 9 plus 16 is 25 And so we get the square root of 25 which is 5 a magnitude of a vector is always positive and this causes us to select choice e