Question

If 0.5 I +0.8j+c is a unit vector then c is

Answer 1

YOUR ANSWER IS HERE ☺️✌️✌️

Answer 2

${.5}^{2} + {.8}^{2} + {c}^{2} = 1 \\ {c }^{2} = 1 - {.5}^{2} - {.8 }^{2} \\ {c}^{2} = .11 \\ c = \sqrt{.11} = .3316$