Question

find the surface area of the following: 504 ft² 127 ft² 254 ft² 150 ft² rewatch

Explanation:

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

The formula for the surface - area of a rectangular prism is $SA = 2(lw+lh + wh)$, where $l$ is the length, $w$ is the width, and $h$ is the height. Here, $l = 9$, $w = 7$, and $h = 4$.

Step2: Calculate $lw$

$lw=9\times7 = 63$

Step3: Calculate $lh$

$lh=9\times4 = 36$

Step4: Calculate $wh$

$wh=7\times4 = 28$

Step5: Substitute into the formula

$SA = 2(63 + 36+28)$
$SA = 2(127)$
$SA = 254$

Answer:

$254\ ft^{2}$