#### Answer

$18x^{11}y^{3}$

#### Work Step by Step

RECALL:
$a^m \cdot a^n = a^{m+n}$
Multiply the coefficients together then use the rule above to the variables to obtain:
$=18x^{4+7}y^{2+1}
\\=18x^{11}y^{3}$

Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$18x^{11}y^{3}$

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