$18, 27, . .99$
$a r = 18$
$d = 9$ $n = ?$

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Solution

$18, 27, . .99$

$a r = 18$

$d = 9, n = ?$

$a_{n} = 99$

$a_{n} = a + (n - 1) d$

$99 = 18 + (n - 1) 9$

$9 - 18 = (n - 1) 9$

$81 = (n - 1) 9$

$\frac{81}{9} = n - 1$

$9 = n - 1$

$70 = n$

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