Are g(t) = f(t) + f(-t) and g(t) = f(t/2) time variant and non-causal filters?

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1.g(t) = f(t) + f(-t)
2. g(t)= f(t/2)
can someone pls explain why these functions are time variant and non causal
 
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This sounds like it's from a DSP course. Is it ? Are you talking about filters ?
 
yeah I am ! they are filters.
 

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