#### Answer

Substituting $n = 4$ in the equation for $a_{n}$ gives:
$a_{4} = 4^{2}-4 = 12$

#### Work Step by Step

For this problem, simply plug in n = 4 into the equation given, $a_n = n^2 -n$

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

Substituting $n = 4$ in the equation for $a_{n}$ gives:
$a_{4} = 4^{2}-4 = 12$

For this problem, simply plug in n = 4 into the equation given, $a_n = n^2 -n$

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