Answer:
Distance between A and B is approximately 6.3 units
Explanation:
We can use the Pythagorean Theorem to solve this question. Notice that the distance in between the two points (straight segment that joins both) can be identified to the "hypotenuse of a right angle triangle shown in the attached image. Such triangle has two legs that measure 2 units one of them and 6 units the other one.
The length of the associated hypotenuse is given then by:

So this rounded to the nearest tenth is:
6.3 units