Can you help me solve these three problems. Thank you!

Find the angle of intersection of the plane $2x4y2z=0$ with the plane $-2x5y-1z=3.$

Answer in radians:

and in degrees:

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$6.$

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Find an equation of a plane containing the three points $(-1,5,5),(4,6,0),(4,7,2)$ in which the coefficient of $x$ is $7.$

$=0.$

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Find the vector equation for the line of intersection of the planes $2x-4yz=-1$ and $2x3z=-1$

$,$

$,0$:

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