Answer
q = $ -1.1 \times 10^{-9} \ C $
Work Step by Step
We know that
$ V = \frac{q}{4\pi \epsilon R } $
Thus, we simplify:
$ q = V 4\pi \epsilon \ R $
We substitute the known values to obtain:
$q=4\cdot\pi(8.85\times10^{-12})(10)(-1)$
q = $ -1.1 \times 10^{-9} \ C $