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Feb28-12, 04:23 AM
Sci Advisor
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tiny-tim's Avatar
P: 26,148
Hi Daniol10! Welcome to PF!

(try using the X2 button just above the Reply box )

ok, so you have an equation d = 96 + 80t - 16t2,

and you need to sove it for (a) d = 0, and (b) d = 96.

sooo just put that value of d into the equation, and solve it as an ordinary quadratic equation in t
what do you get?