Answer
$41\leq F\leq 50$
Work Step by Step
We know that the Celsius temperature is restricted to lie between $10$ and $5$ degrees, so we have:
$5 \leq\frac{5}{9}(F-32)\leq 10$
$5*9/5 \leq F-32\leq 10*9/5$
$9\leq F-32\leq 18$
$41\leq F\leq 50$
So the equivalent temperature range in Fahrenheit is between $50$ and $41$ degrees.
