What needs to happen for the equation ch4 + o2 →  co2 + h2o to be balanced? a. a coefficient of 2 must be added before both products. b. a coefficient of 2 must be added before the second reactant and the second product. c. nothing, the equation is already balanced. d. a coefficient of 2 must be added before both products and reactants.

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.