Respuesta :

BakaMinty

Answer:

if my brain cell works, then (24x + 160) in

Step-by-step explanation:

20(3x + 8) - 12 x 3x = 24x + 160

Area of border is 24x + 160 inch²

Given that;

Width = 3x inch

Length = 12 inch

Border size = 4 inch

Find:

Area of border

Full width = 3x + 4 + 4 = 3x + 8 inch

Full length = 12 + 4 + 4 = 20 inch

Area of border = [(3x + 8)(20)] - [(3x)(12)]

Area of border = [60x + 160] - [36x]

Area of border = 60x - 36x + 160

Area of border = 24x + 160 inch²

Learn more:

https://brainly.com/question/23762846?referrer=searchResults

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