Question

Fill in the blank

$\begin{array}{ccc}140& 29& \left(13\right)\\ 82& 18& \left(10\right)\\ 120& 24& (-)\\ a& b& c\end{array}$

Answer 1

The series follows:
$\sqrt{a+b}=c$
$140+29=169;$ $\sqrt{169}$ $=13$
$82+18=100;$ $\sqrt{100}$ $=10$
$120+24=144;$$\sqrt{144}$ $=12$