$\"\"$

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The given values are $\"\"$ .

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The nth term of the arithmetic series $\"\"$ .

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Where $\"\"$ is the first term and $\"\"$ is the nth term.

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$\"\"$ (Substitute $\"\"$ ) $\"\"$

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Apply addition property of equality: a = b then $\"\"$ .

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$\"\"$ (Add 2 to each side)

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$\"\"$ (Add: 9 + 2 = 11)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ ) $\"\"$

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Apply multiplication property of equality: If a = b then $\"\"$ .

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$\"\"$ (Multiply each side by 3)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Multiply: $\"\"$ )

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Apply addition property of equality: a = b then $\"\"$ .

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$\"\"$ (Add 1 to each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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n = 34 (Add: 33 + 1 = 34) $\"\"$

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Apply addition property of equality: a = b then $\"\"$ .

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$\"\"$ (Subtract 95 from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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Apply division property of equality: a = b then $\"\"$ .

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$\"\"$ (Divide each side by negative 4)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$ The sum of an arithmetic series $\"\"$ .

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Where $\"\"$ is the first term and $\"\"$ is the nth term.

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Divide: $\"\"$ $\"\"$ ) $\"\"$

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The value of $\"\"$ .