## Precalculus (10th Edition)

$26$
The magnitude $||v||$ of a vector $v=ai+bj$ is given by the formula: $||v||=\sqrt{a^2+b^2}$ Hence, using the formula gives $||v||=\sqrt{10^2+(-24)^2}\\ ||v||=\sqrt{100+576}\\ ||v||=\sqrt{676}\\ ||v||=26$