Question

please help it is urgent and I will mark brainliest​

Answer 1

A =2i+3j+ 4 k

B=I+j+k

just multiply it normally as it is a scalar quantity

A.B=2×1+3×1+4×1

A.B=2+3+4=9

1/9(AB)=9/9=1

Answer 2

Answer:

sorry bro i have written it very fast so handwriting is not gud

but i think this will help u