a)
[tex]A=\{-4,-3,-2,\ldots,99\}\Rightarrow |A|=104\\[/tex]
b)
[tex]3x^3=0,375\\x^3=0,125\\x=0,5[/tex]
[tex]|A|=1[/tex]
c)
[tex]x^2+1 < 0\\x^2 < -1\\x\in\emptyset[/tex]
[tex]|A|=0[/tex]
d)
[tex]x^2=9\\x=-3 \vee x=3\\-3\not\in\mathbb{N}[/tex]
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a)
[tex]A=\{-4,-3,-2,\ldots,99\}\Rightarrow |A|=104\\[/tex]
b)
[tex]3x^3=0,375\\x^3=0,125\\x=0,5[/tex]
[tex]|A|=1[/tex]
c)
[tex]x^2+1 < 0\\x^2 < -1\\x\in\emptyset[/tex]
[tex]|A|=0[/tex]
d)
[tex]x^2=9\\x=-3 \vee x=3\\-3\not\in\mathbb{N}[/tex]
[tex]|A|=1[/tex]