The quotient arising from the division of $24446$ by a certain divisor is $79$ and the remainder is $35$. What is the divisor?

$18.5 \%$ of $220 + 12.4 \%$ of $680 = ?$

$\sqrt{2601} - \sqrt{1156} + \sqrt{484} = ?$

What is the least number that must be added to $4042$ to make it a perfect square?

The numerator of a fraction is the product of two numbers. One of the numbers is greater than the other by $2$. The greater number is smaller than the denominator $D = 7+c$ (where $c > -7$ is a constant). If the fraction is $f(x) = \frac{(x-2)x}{x+k}$ (where $x$ is the greater number),find the minimum value of the fraction.

The square root of $\left[\frac{(3.25)^{3}}{3.25-1}-\left(3.25+(3.25)^{2}+1\right)\right]$ is equal to