Use the Appropriate Formula to Find the Indicated Figurate Number $\mathrm { O } _ { 15 } = 225$

question 2

Multiple Choice

Use the appropriate formula to find the indicated figurate number.
-the 15th octagonal number

• A) \(\mathrm { O } _ { 15 } = 225\)
• B) \(\mathrm { O } _ { 15 } = 82.5\)
• C) \(\mathrm { O } _ { 15 } = 645\)
• D) \(\mathrm { O } _ { 15 } = 187.5\)

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