Your answer is the first option.
Let x be the amount they must sell
X * 2.5 ≥ 135
X ≥ 54
The triangle prism has 5 sides.
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Area of the bottom rectangle:
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Area = 6 x 7 = 42 m²
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Area of the 2 triangles:
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Area = 2 [ 1/2 x 6 x 4] = 24 m²
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Area of the 2 side rectangle:
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Area = 2 [ 5 x 7] 70 m²
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Total area:
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Total Area = 42 + 24 + 70 = 136 m²
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Answer: Surface area = 136m²
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Use the Quadratic formula,
x= -b +/- sqrt(b^2-4ac)
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2a
x= 4 +/- sqrt(16+12)
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-6
x = 4+/- sqrt(28)
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-6
x = 4 +/- 2*sqrt(7)
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-6
x= 2(2+/- sqrt(7))
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2(-3)
x= 2+/- sqrt(7)
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-3