Given the reaction C + 02 → CO2 which pair of reactions represents the two half-reactions?

O C→CO2 + 4e

O2 + 4e + CO2

o C + 4e → CO2

O2 → CO2 + 4e

o C-C02+2e

O2 + 2e + CO2

o C + 2e → CO2

02 → CO2 + 2e

Is 1.4949949994 ... a rational number

How do you answer 5X ^2-35

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