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What is the focus of the parabola x^2 = -4y? Write -12 in the form a/b, using integers to show rational numbers.? 8,000 trees year 0. after 3 years 6,000 trees how long to reduce to 3,000 and what is value of k? Galileo, newton, einstein, and hawking; what is the relationship between mass and gravity? A+B<->G+D. The concentration of A is two times more than B. After equilibria, the concentration of G is 3times more than B. What's the Kc?