#3**+2 **

AB is 10 units

10^2=100

You need 2 squared numbers that add or subtract to 100 (pythagoras's theorum)They will be the distances from A to X and B to X

You should be able to take it from there,

Melody Aug 1, 2019

#4**+3 **

Approach this by first drawing circles centred on point (-5,0) of radii 1, 2, 3 ... 10.

Then draw circles centred on point (5,0) with the same radii.

At the points where these circles intersect the distance from A is a positive integer less than or equal to 10, as is the distance from B.

It is a simple matter to count these intersection points. There are, indeed, 119 of them.

Alan Aug 1, 2019

#7**+1 **

My goodness. That person has taken way too many psychedelic drugs!

Thanks Alan :))

Melody
Aug 2, 2019