## Intermediate Algebra (6th Edition)

$a_{13} = 33$
Arithmetic sequence: $-3,0,3,...$ $a_{1}= -3$ $d= 0-(-3) = 3$ Using the formula, $a_{n} = a_{1}+(n-1)d$ $a_{13} = -3+(13-1) (3)$ $= -3+(12)(3)$ $= -3+36$ $a_{13} = 33$