#### 23:54
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- #### 7.18
- \( 200 \times 0.59049 = 118.098 \) mg/L
- #### 118.10
- \( w = \frac{-2 \pm \sqrt{2^2 - 4(1)(-52)}}{2} = \frac{-2 \pm \sqrt{4 + 208}}{2} = \frac{-2 \pm \sqrt{212}}{2} \)
- \( \sqrt{212} = \sqrt{4 \times 53} = 2\sqrt{53} \approx 2 \times 7.28 = 14.56 \)
- \( w = \frac{-2 + 14.56}{2} = \frac{12.56}{2} = 6.28 \)
