8-13. Vector-valued functions Find a function ( mathbf{r}(t) ) that describes each of the following curves. 8. The line segment from ( P(2,-3,0) ) to ( Q(1,4,9) ) 9. The line passing through the point ( P(4,-2,3) ) that is orthogonal to the lines ( mathbf{R}(t)=langle t, 5 t, 2 t angle ) and ( mathbf{S}(t)=langle t+1,-1,3 t-1 angle ) 10. A circle of radius 3 centered at ( (2,1,0) ) that lies in the plane ( y=1 ) 11. An ellipse in the plane ( x=2 ) satisfying the equation ( frac{y^{2}}{9}+frac{z^{2}}{16}=1 )
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