- IS THE REACTION BETWEEN HYDROGEN AND BROMINE GAS ENDOTHERMIC AND WHY WITHOUT DOING ANY CALCULATIONS?

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I need help simplifying this expression
6-2[3(x+1)-5]
I keep getting 12x-8 but its says the correct answer is 10-6x? The sun orbit of a spacecraft has perihelion distance 1 AU and aphelion distance 4 AU. What is the length of semi-major axis of orbit in AU? Math Question Trigonometry-? At standard condition, gaseous chlorine is heavier than gaseous fluorine by? (Compare using density)? Simplify (1-a/a) / (a-1) its suppose to be -1/a but I don t know how to get there. Please show steps?