Question

sa = 2lw + 2lh + 2hw
sa = 2(8)(1.75) + 2(8)(12.25) + 2(12.25)(1.75)

Explanation:

Step1: Calculate the first product

$2\times8\times1.75 = 28$

Step2: Calculate the second product

$2\times8\times12.25=196$

Step3: Calculate the third product

$2\times12.25\times1.75 = 42.875$

Step4: Sum up the results

$28 + 196+42.875=266.875$

Answer:

$266.875$