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Vectors in 3D: How to find equation of line through (1,2,-1) parallel to plane 5x+y+7z=20? How will radio waves effect human body? Does electricity cause poltergeists? The total cost C of gasoline is $3.00 times the number of gallons g? Direct variation? If angle a is congruent to angle b, and measure of angle a = 37, then measure of angle b = 37. I donâ€™t understand where to start after given?