Given that A= -2i + 5j and B = 3i - j. Find the magnitude of the scalar products of vectors A-B.

Given that A= -2i + 5j and B = 3i - j.
Find the magnitude of the scalar products of vectors A-B.
Find the angles between two vectors A and B.
Find the angle alpha of vector A.
Find the angle alpha of vector B.
What is the magnitude of the Summation of x in the product of A x B.

magnitude of A-B=root(61)
angle between two scalar=130.240 degree
cant understand any other questions make it clear , its damn easy!!!i will solve it!!