Please, will you tell me how to get the answer to this? Mostly, I think my issue is with the 10, but I'm not sure.
In an engineering test, a rocket sled is propelled into a target. The sledís distance d in meters from the target is given by the formula d= -1.5t2+120 where t is the number of seconds after rocket ignition. How many seconds have passed since rocket ignition when the sled is 10 meters from the target?
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