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OpenStudy (anonymous):
y=f(t)=-11+120t-16t^2 ft.. A) when, if ever, is the projectile 189 ft above the ground?
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OpenStudy (saifoo.khan):
189 =-11+120t-16t^2 Solve.
OpenStudy (anonymous):
oki
OpenStudy (anonymous):
200=8t(15-2t)
OpenStudy (saifoo.khan):
\[\checkmark\]
OpenStudy (anonymous):
wht do i next?
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OpenStudy (saifoo.khan):
25 = t(15 - 2t) 25 = 15t - 2t^2 Quadratic.
OpenStudy (anonymous):
so solve for t?
OpenStudy (anonymous):
so i got t=1.4, -8.9
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