Question

answer attempt 1 out of 2
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Explanation:

Step1: Identify the surface - area formula for a rectangular prism

The surface - area formula of a rectangular prism is $S = 2(ab+bc + ac)$, where $a$, $b$, and $c$ are the lengths of the three sides of the rectangular prism. Here, $a = 3m$, $b = 3m$, and $c = 6m$.

Step2: Calculate $ab$

$ab=3\times3 = 9$

Step3: Calculate $bc$

$bc = 3\times6=18$

Step4: Calculate $ac$

$ac=3\times6 = 18$

Step5: Substitute into the formula

$S=2(9 + 18+18)$
$S=2\times45$
$S = 90$

Answer:

$90$