If $A_{n} = 3 - 8 n$
What is $A_{11} - A_{9}$ ?

- 20

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- 16

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12

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15

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Solution

The correct option is B $- 16$
$A_{n} = 3 - 8 n$
$A_{11} = 3 - 8 (11) = 3 - 88 = - 85$
$A_{9} = 3 - 8 (9) = 3 - 72 = - 69$
$A_{11} - A_{9} = - 85 - (- 69) = - 16$

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