Answer
$8.862$
Work Step by Step
$\frac{800}{100-e^{\frac{x}{2}}}=50$
$4200=50e^{\frac{x}{2}}$
$84=\frac{x}{2}$ $ln(e)$ $x=2ln84$
$\approx 8.861688598$
$=8.862$
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