ISI 2009 math doubt

[Halflife]

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[Algaeconomics]

F(9) = F( 1 +8 ) = F( 1*8)= F(8) = 9

[Halflife]

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[Algaeconomics]

Sorry.
F(8) = F(4+4) = F(4.4) = F(16) = 9
F(16)= F(8+8)= F(8.8) = F(64)= 9
F(64)= F(16.4)= F(16+4)= F(20)= F(4.5)= F(4+5)= F(9) = 9

[Halflife]

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[Algaeconomics]

Hey Halflife,
Can you please help me with question 28, ISI 2013.

[Halflife]

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[Halflife]

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[Algaeconomics]

Thanks halflife :)