Hello, ich have some Questions

The grey Orks (right) assault the Formation Leman Russ Battle Tanlks. All Grey orks are in Range (15cm) to the silver Battle Tank but not to the other Tanks.
1. How many Tanks can be destroyed by the Orks ? The Formation or only the one silver Tanke, because he is the only one in Range to the Orks.
Support Fire.
Quote:
Calling on support allows units from other formations to attack with their firefight value if they are within 15cm and have a line of fire to an
enemy unit directly involved in the assault. In this case ‘directly involved’ means belonging to the attacking or defending formation(s) and in a position to attack.
The Green Orks are in Range to the Battletank Formation, but only one Unit is in Range to the Silver tank.
1. Wich Orks can make support Fire and how many Tanks can be destroyed?
Can only one Ork Unit make support Fire because he is in Range or the Formaztion because all are in Range to the Battle Tank Formation.
Can all Tanks within the Range of the Support Fire-Orks (15cm) be destroyed or only the Silver Tank?
What, if the Grey Orks (the Attacking Formation) destroy the Silver Tank.. Is Supportfire still possible?
And what ist " i
n a position to attack"
Thanks for the answers..