If a toy rocket is launched vertically upward from ground level with an initial velocity of 128 ft./s, then its height H after T seconds is given by the equation h(t)= -256t + 128t (if air resistance is neglected). How long will it take for the rocket to return to the ground?

step-by-step explanation:

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step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2

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step-by-step explanation: