Answer: b
the answer is b
in order to solve for AB you need to use the pythagorean theorem by making a triangle with AB as one of the sides of the triangle.
plot each point A and B and connect it and connect point B with the x-axis, (3,0) You'll see athat a triangle has formed. All you have to do after that is apply the Pythagorean theorem.
the distance from A to the new point (3,0) is 3, the distance from the new point to B is 4. Line AB will be the hypotenuse.
Pythagorean therom is a^2+b^2=c^2
so 3^2+4^2=c^2
= 9+16=25
square root the 25 and you get a 5.
