Resposta :

a=16
a=2^4

x=1,25
x=125/100
x=5/4

a^x=
[(2^4)^5/4]=
[(2)^5]=
32 

Letra (b)

[tex]16= 2^{4} ==> 2^{4.1,25}==>2^{5}===> 32[/tex]

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