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48 1. Exprimer le périmètre P de
ce polygone en fonction de x:
a. sous la forme d'une somme;
b. sous la forme d'un produit.
2. Calculer ce périmètre pour :
• x= 3,5
5.
.x = 2​

-y

Explanation:

idk i’m struggling too

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-