output $=$ f$\text{'}\{2*2\}\text{'}$

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Correct

$4$

No $=$ is provided, so output is just the result of $2*2.$

$2)$

output $=$ f$\text{'}\{2*2=\}\text{'}$

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$2*2=4$

$=$ after the expression in the replacement field causes the expression and its result to be assigned to output.

$3)$

kids $=4$

adults $=2$

output $=$ f$\text{'}\{$kids$+$adults$\}$ total'

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$4)$

kids $=4$

adults $=2$

output $=$ f$\text{'}\{$kids$+$adults$=\}$ total'

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$5)$

output $=$ f$\text{'}\{\{2\}\}+\{\{3\}\}=\{\{5\}\}\text{'}$