Four Fours/18

Puzzle

Using exactly $4$ instances of the number $4$, the task is to write an expression for $18$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$18 = 4 \times 4 + \dfrac 4 {\sqrt 4}$

Solution $2$

$18 = 4 \times 4 + 4 - \sqrt 4$

Solution $3$

$18 = \dfrac {44} {\sqrt 4} - 4$

Also see

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