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Two Projectiles Shot in Air

Two projectiles are shot into the air over a lake. The paths of the projectiles are given by the following equations:
(a) y = -0.0013xx + x + 10 and
(b) y = - (1/81)xx + (4/3)x + 10
where y s the height and x is the horizontal distance traveled. Determine which projectile travels farther by substituting y = 0 in each equation and finding x.

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