A trebuchet launches a projectile on a parabolic arc from a height of 47 ft. at a velocity of 40 ft/s. Determine when the projectile will first reach a height of 60 ft. and how many seconds later it will again be at 60 feet. Round to the nearest tenth. First time to reach a height of 60 feet:
seconds

Second time to reach a height of 60 feet:
seconds

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option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.

okay..i will pick 8!