C$4.(4$ pta$)$ A passenger plane fiying to Casablanca takes off from listanbul Airport and the plane reaches the required alitude at the polnt $(42\mathrm{.}8,25\mathrm{.}3).$ If the desired route passes through the polnt $(39\mathrm{.}9,4\mathrm{.}7),$ aesuming that the route is a line, fied the parametric vector equation for the route.

A$)f=(39\mathrm{.}8-7\mathrm{.}2t,29\mathrm{.}44\mathrm{.}6t)$

B$)f=(42\mathrm{.}8-2\mathrm{.}94,25\mathrm{.}3-20\mathrm{.}6t)$

C$)F=(42\mathrm{.}0-1\mathrm{.}3t,36\mathrm{.}313\mathrm{.}2t)$

D$)f=(44\mathrm{.}92\mathrm{.}7t,19\mathrm{.}7-6\mathrm{.}0t)$

E$)f=(40\mathrm{.}6-8\mathrm{.}9t,30\mathrm{.}815\mathrm{.}2t)$

C$5.(4$ pts$)$ Which of the following is the equation of the plane passing through the points $(3,0,0),(0,1,0)$ and $(0,0,2)?$

A$)6x3y2z-6=0$

B$)6z-3x-2y6=0$

C$)2y3x6z-6=0$

D$)6y2x3x-6=0$

E$)6x2y3z-6=0$

C$6.(4$ pts$)$ Let $f(x,y,z)=\frac{1}{\sqrt[\phantom{2}]{r-z^2-y^2-z^2}}.$ Which of the following is the domain of $f$

A$)$