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The height h​ (in feet) of a fireworks shell shot vertically upward as a function of time t​ (in s) is h(t)=-16t^2+144t+4 . How long should the fuse last so that the shell explodes at the top of its​ trajectory?

Respuesta :

Answer:

Step-by-step explanation:

h(t)=16t²+144t +4

=16(t²+9t+(9/2)²)-16(9/2)²+4

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