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Spaced repetition: each system comes back just before you would forget it. Fast, correct answers stretch the interval; a miss brings it back the same day.

Free practice: Mirror systemScore 0/0
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On the table, the ringed ball is your ball (1). 2 = the ball your cue ball hits first, 3 = the last ball to hit for the point.
Mirror system
Aim = Start + (Arrival − Start) × D1 ÷ (D1 + D2)
Your ball:White(cue ball · 1)
Ball 2Red
Expected shot:Mirror systemBricole (cushion first)Cushion orderLong

The cue ball goes to the cushions before touching any ball; after the cushions in order it hits the balls.

Given:
D1: distance of the cue ball from the mirror line2D2: distance of the ghost ball from the mirror line2Start: position of the cue ball along the cushion6Arrival: position of the ghost ball along the cushion2
In this position, what is Aim?

Task: put the given values into the system's formula and calculate Aim. Enter the answer as the number read on the table's Aim scale.