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Can you help me out with number 1? Anyone? Please? 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? How to do 3b? 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? Of the following elements, - has the most negative electron affinity. a. H b. Br c. Cl d. I e. F?