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1) P= 2(7x) + 2(3x-1) = 38
14x + 6x - 2 = 38
20x = 40
x = 2
A = 28*10 = 280
2) a) P = 8x = 64
x = 8
Los lados son: 8, 16, 24.
b) P= 14x = 98
x = 7
Los lados son: 35 y 14
c) P= 2(2x+2) + 2(x+3) = 130
(4x+4) + (2x+6)= 130
6x = 120
x = 20
Los lados son: 42 y 23
d) 5x + 5 = 100
5x = 95
x = 19
El lado es igual a 19, con gusto.