Answer
$x$ = $40.62$
Work Step by Step
i) z score corresponding to 9th percentile = -1.34
ii) Substitute z = -1.34, $\sigma$ = 7 and $\mu$ = 50 into z = $\frac{x - \mu}{\sigma}$
z = $\frac{x - \mu}{\sigma}$
$x$ = $\mu$ + $z\sigma$
$x$ = $50 + (-1.34 \times 7)$
$x$ = $40.62$