Answer
d=9
Work Step by Step
Use the distance formula:
$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$
$d=\sqrt{(0-0)^2+(12-3))^2}$
$d=\sqrt{0^2+9^2}$
$d=\sqrt{81}$
$d=9$
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