What do the following equations represent in r3? match the two sets of letters: a. a vertical plane b. a horizontal plane c. a plane which is neither vertical nor horizontal b \displaystyle{b}b a. −9x+6y=4 b. x=6 c. y=−7 a \displaystyle{a}a d. z=0 a "horizontal" plane is parallel to the xy plane. it's normal vector is parallel to the normal vector of the xy plane. a "perpendicular" plane has a normal vector perpendicular to the normal vector for the xy plane hence its normal vector lies in the xy plane

Need ! a certain ultraviolet ray has a frequency of 1 × 1016 hz, and a certain infrared ray has a frequency of 2 × 1012 hz. which of the following is true? a. the frequency of the ultraviolet ray is fifty thousand times the frequency of the infrared ray. b. the frequency of the infrared ray is fifty thousand times the frequency of the ultraviolet ray. c. the frequency of the ultraviolet ray is five thousand times the frequency of the infrared ray. d. the frequency of the infrared ray is five thousand times the frequency of the ultraviolet ray.