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Question 25b30e10

Advanced Math - Nonlinear functions

ABC

The function $f$ is defined by $f (x) = 4 x^{- 1}$ . What is the value of $f left parenthesis 21 right parenthesis$ ?

$negative 84$

$\frac{1}{84}$

$\frac{4}{21}$

$StartFraction 21 Over 4 EndFraction$

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