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How many liters of oxygen at 23° C and 1.12 atm will be required for the combustion of 10.0 g of methane, CH4 having trouble? Can someone help me with this proof about injectivity/surjectivity? Thanks in advance. If f(x) is (x^2)+5 when x < 2 and f(x) is 7x-5 when X is greater or equal than 2, then what must be true? BIOLOGY QUESTION ABOUT THE BRAIN? Can you explain why √[(1 - √3)²] = √3 - 1 not 1 - √3 ?