If 
resistor are connected in series, total resistance equals ________.
Definitions:
Income Before Taxes
The gross income a person or corporation earns before taxes are deducted.
Marginal Tax Rate
The rate at which an additional dollar of income is taxed, serving as a useful measure of the impact of taxes on incentives to earn more.
Average Tax Rate
The ratio of the total amount of taxes paid to the taxpayer's total taxable income.
Federal Income Tax
A tax levied by the federal government on individuals' and businesses' annual earnings, used to fund public services and government obligations.
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