Calculate the total surface area of potato chip B using the formula, Total surface area = 2XY + 2XZ + 2YZ The dimensions of potato chip B are: Length of X = 5.0 cm Length of Y = 2.0 cm Length of Z = 2.0 cm Using the dimensions, we can compute: Total surface area = 2(5.0)(2.0) + 2(5.0)(2.0) + 2(2.0)(2.0) Total surface area = 20 + 20 + 8 Total surface area = 48 cm² - Edexcel - GCSE Biology - Question 9 - 2018 - Paper 1

Using the formula for total surface area:

$$ext{Total surface area} = 2XY + 2XZ + 2YZ$$

Substituting the dimensions of potato chip B:

• Length of X = 5.0 cm
• Length of Y = 2.0 cm
• Length of Z = 2.0 cm

Calculate each part:

1. Calculate $2XY$:

   $2XY = 2(5.0)(2.0) = 20$

2. Calculate $2XZ$:

   $2XZ = 2(5.0)(2.0) = 20$

3. Calculate $2YZ$:

   $2YZ = 2(2.0)(2.0) = 8$

Adding all these together gives:

$ext{Total surface area} = 20 + 20 + 8 = 48 ext{ cm}^2$