The area of a rectangular field is $3584 m^2$, and its length and breadth are in the ratio $7: 2$. What is the perimeter of the field?

Find the value of the question mark (?) in the following.

$?=24-{\left(24\right)}^2+24\times (24÷0.24+24)$.

The value of the question mark (?) in the following expression is:

$?=\sqrt{7+4\sqrt{3}}$