Answer
$\frac{(-3.55,-2.2,1.25)}{\sqrt{19.005}}$
Work Step by Step
We know that $ai+bj+ck=(a,b,c).$
We know that for a matrix
$
\left[\begin{array}{rrr}
a & b & c \\
d &e & f \\
g &h & i \\
\end{array} \right]
$
the determinant, $D=a(ei-fh)-b(di-fg)+c(dh-eg).$
A vector orthogonal to $u$ and $v$ is $u\times v$.
$u×v$ is the determinant of the matrix $\begin{bmatrix}
i& j & k \\
-3& 2&-5\\
0.5&-0.75 &0.1 \\
\end{bmatrix}
$
Thus $u×v=(-3.55,-2.2,1.25).$
And a unit vector parallel to this is: $\frac{u\times v}{|u\times v|}=\frac{(-3.55,-2.2,1.25)}{\sqrt{(-3.55)^2+(-2.2)^2+1.25^2}}=\frac{(-3.55,-2.2,1.25)}{\sqrt{19.005}}$
