help!

Question

help!

anonymous · Answer

Ashley is digging for rocks at a geological site. She has 140 meters of rope and 4 stakes to mark off a rectangular area. Which set of dimensions will create a rectangle using all the rope Ashley has with her?

 14 m × 10 m
 70 m × 70 m
 60 m × 10 m
 55 m × 10 m
@Michele_Laino

michele_laino · Answer

If I call with x and y, the requested dimensions, then we have the subsequent consitions:
$$\Large  \begin{gathered}
  2\left( {x + y} \right) = 140 \hfill \
   \hfill \
  x + y = 70 \hfill \ 
\end{gathered} $$

anonymous · Answer

ok then

michele_laino · Answer

so you have to search for the option like
n * m, such that
n+m=70

michele_laino · Answer

for example thge first option says:
n=14 and m=10,
so n+m=14+10= 24 which is not 70, so the first option is not correct!

anonymous · Answer

ok is it b

michele_laino · Answer

option B can not be the right one, since we have:
m=N=70, and n+m=70+70=140, which is not 70

anonymous · Answer

wait no its C!

michele_laino · Answer

yes! we have this:
|dw:1440529086680:dw|