When you draw the vectors, you form a right triangle:
By the Pythagorean theorem,Code:|\ | \ 2.9 | \ 4.55 | \ | \ V-----> B
For part 2, A - B = A + (-B):
The triangle doesn't change from part (1) and so the magnitudes should all be the same (but not the direction).Code:/| / | A - B / | A / | / | *<----V B
You can see that the direction of A - B is south and to the west by a few degrees. Use trigonometry to find the upper angle to determine the exact direction.