reaches its maximum can be determined in couple of ways. If you know calculus, you differentiate the quadratic, set to 0 and solve: 
. If you do not yet know how to do that, you can just apply the following argument: 
will be non-positive for any x. The largest it can be is 0. So the entire function 
and that happens exactly for x=3 (seconds). 
Guys
anyway can anyone explain how to do 12. (a
just letter a
...
Answers: 2
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