Pre-caclulus ? ?

(b) find 3 piece-wise functions n(x) for the data algebraically. let n represent the number of threatened and endangered fish species. let x=6 correspond to 1996.

(c) use your models from part (b) to complete the table below:

x 6 7 8 9 10 11 12 13
n(x) ? ? ? ? ? ? ? ?

I do not know what x = to sorry but i tried it see
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In this problem it decreased 20%