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How can I heat water to 150 F using a 9v battery (or any common battery)? What's the greatest source of human-usable energy in the universe? is it the power of a star? Find the zeros of the equation y=x^2-16. I'm having a brain freeze on how to do this. Thank you!? What is 3x + 1 = 10? 3 different Ways the k truss design is used in real life?