Can anyone help me with this chemistry problem?

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A+B+2C--->2D+3E
where the rate law is
Rate= -delta[A]/delta(t) = k[A]^2

An experiment is carried out where [A]o=1.0x10^-2M, o=3.0M, and [C]o=2.0M. The reaction is started, and after 8.0 seconds, the concentration of A is 3.8x10^-3M.

a)Calculate k for this reaction.
b)Calculate the half-life for this experiment.
c)Calculate the concentration of A after 13 seconds.
d)Calculate the concentration of C after 13 seconds.

Please help me and show your work. I really need help. Thanks a lot.
 
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