- Why was Carl Sagan involved in all messages that went to space?

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Qd = 9 – P + P` + 3P``
Qst = -1 + 4p – P` – 5p``
with P(0) = 4 and P`(0) = 4? What is the conductivity limit for purified water used in cosmetics? What is the equation of the line that passes through the points (-3, 1) and (-5, 7) ? Hey, talented physics guys, help me to solve this problem.? Help me to solve this two questions, especially number 3.?