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You have one regular attack and one extra attack. You can attack one target twice and one target once, or three different targets once. This is not quite the same as three attacks, as three attacks would allow you to attack one target thrice, while Horde Breaker requires that you attack a different target. But yes, the total of attacks is 3.
Yes, you make three attacks. With Extra Attack you attack twice when taking the Attack action. Having attacked with a weapon, you satisfy the prereq for Horde Breaker, and can now make another attack. Note that PHB5e ca. p.194 helps draw the distinction between "Attack action" and "make an attack."
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