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# How to go about this (Calculus work)?

### 1 Answer

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- The GnosticLv 72 months ago
1. V = W * L * h = 2x²h. As V = 10, h = 5/(x²).

2. C = $7 × (W * L) + $3 × 2h(W + L) = $14x² + $90/x

C' = $28x - $90/(x²)

3. When C' = 0, 28x = 90/x², x³ = 90/28 = 45/14; x ≈1.476; h ≈ 2.295

C ≈ $121.98

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