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1464 inch²

Step-by-step explanation:

given first prism sides: length - 10 width - 10 height - 10

given second prism sides: length - 12 width - 12 height - 12

using the formula below:

for the first prism:

2(10*10+10*10+10*10)

600 inch²

for the second prism:

2(12*12+12*12+12*12)

864 inch²

So total surface area is (864 inch² + 600 inch²) =1464 inch²

if x = 1, then the answer is 3.5