Question

Stuck on two. Plz help. Pre-all is hard

Answer 1

#1. The square root of a number is 9 and -9

√(81) = 9 or -9

#2. Take the square root of 4,840 yards²

√(4840) = 69.57 yards

It's B, between 69 and 70 yards

Answer 2

$\bf 1)~\hspace{7em} \begin{array}{|l|ll} \cline{1-1} ~\hfill \sqrt{x}=9~\hfill \\ \cline{1-1}\\ \pm \sqrt{x}=9\\\\ \sqrt{x}=\mp 9\\\\ ~\hfill \text{\huge -9}~\hfill\\\\ \cline{1-1} \end{array} \\\\[-0.35em] \rule{34em}{0.25pt}$

$\bf 2) \\\\\\ \textit{area of a square}\\\\ A=s^2~~ \begin{cases} s=length~of\\ \qquad a~side\\[-0.5em] \hrulefill\\ A=4840 \end{cases}\implies 4840=s^2\implies \sqrt{4840}=s \\\\\\ 69.57\approx s~\hspace{5em}\boxed{69}\rule[0.35em]{7em}{0.25pt}\stackrel{\sqrt{4840}}{69.57}\rule[0.35em]{9em}{0.25pt}\boxed{70}$