Use the Partial Sum Formula to Find the Partial Sum $9,15,21 , \ldots$

question 129

Multiple Choice

Use the partial sum formula to find the partial sum of the given arithmetic sequence.
-Find the sum of the first five terms of the arithmetic sequence $9,15,21 , \ldots$

• A) 45
• B) 75
• C) 105
• D) 210

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Definitions:

Taxable Income

The portion of an individual's or a corporation's income that is subject to taxes according to governmental regulations.

Marginal Tax Rate

The tax rate that applies to the next dollar of taxable income, indicating the percentage of any additional income that will be paid in taxes.

Taxable Income

The portion of an individual's or corporation's income that is subject to taxes by the government, after all deductions and exemptions.

Average Tax Rate

The ratio of the total amount of taxes paid to the total tax base (income), showing the percentage of income paid in taxes.