Resposta :
[tex]N=\frac{5C+28}{4} \\
\\
40=\frac{5C+28}{4} \\
\\
160=5C+28 \\
\\
5C=160-28 \\
\\
5C=132 \\
\\
C= 26,4 \ cm[/tex]
N= 5XC+28 E DIVIDE POR 4
n = 5c + 28
4
5c + 28 = 40
4
5c + 28 = 160
5c = 160 - 28
5c = 132
c = 132
5
c = 26,4cm