Need Help with Physcis

Should be easy, I just need a confirmation on my process and answer before i turn it in.

 Spoiler

Vector A has a magnitude of 6.00 units, vector B has a magnitude if 7.00 units, and A * B has a value of 14.0. What is the angle between the directions of A and B?

Have no idea how to do this...

 Spoiler

In Fig. 3-31(below), a "vector a" with magnitude of 17.0m is directed at angle Theta =56.0 degrees counterclockwise from the +X axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle Theta1 = 18.0 degrees with respect to the first. What are the componets © a1x and (d) a1y in this primed coordinate system?

thanks in advance