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Billy's prism will require more material by 30 square cm

Step-by-step explanation:

Billy's Prism: 2cm, 8cm, & 10cm

2lw + 2lh + 2wh - Formula for Surface Area (l = length, w = width, & h = height)

2(2)(8) + 2(2)(10) + 2(8)(10)

= 32 + 40 + 160

= 232 cm squared

Charlie's Prism: 9cm, 5cm, & 4cm

2lw + 2lh + 2wh - Formula for Surface Area (l = length, w = width, & h = height)

2(9)(5) + 2(9)(4) + 2(5)(4)

= 90 + 72 + 40

= 202 cm squared

Billy's Prism - Charlie's Prism = 232 - 202 = 30 cm squared

So, Billy's prism will require more material by 30 square cm