Question

how to solve this guys plzz Tell me.....

Answer 1

from which standard
I'm not able to answer

Answer 2

component of a along b=a dot product of b/MAGNITUDE OF B
                                    =(6+14+15) /$\sqrt{ 3^{2} + 2^{2} + 5^{2} }$
                                    =35/$\sqrt{38}$