Question

answer attempt 1 out of 1
blank km² submit answer

Explanation:

Step1: Recall surface - area formula for 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. Here $a = 3$, $b = 4$, and $c = 5$.

Step2: Calculate the three products

$ab=3\times4 = 12$, $bc = 4\times5=20$, $ac=3\times5 = 15$.

Step3: Calculate the sum of the products

$ab + bc+ac=12 + 20+15=47$.

Step4: Multiply by 2

$S=2\times47 = 94$.

Answer:

$94$