- 7^3 means?

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Please help with this thermodynamic/ biology problem! im not sure how to find A or B? What is the expresion of the chemical composition of a compound? What are the factors of the equation b2+5b-35=3b? According to Marti, how many races exist? HELP! Predict the equilibrium concentration of H+ in a 0.25 M solution of H2SO4-? Ka2=0.012?