- Is there any proof about the substance of space being mass less?

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If you're given 2 system of equations that are planes, and you are given a point, how to find equation of line perpendicular to given? Strongest sedative? 2-4 scoops = 1 gram. I need to take 2-3 grams. What range of scoops do I need to take? Thank you.? How many moles of potassium bromide are in 68.5ml of a 1.65M solution? Vector A makes an angle of 20° and B makes an angle of 110° with the x axis. The magnitudes of A= 20 mag of b = 30. Find angle of resultant?