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K = 2 (3x + 2 + 2x + 1)
26 = 3x + 2
26 - 2 = 3x
24 = 3x
x = 24 / 3 = 8
2x + 1 = 2(8) + 1 = 16 + 1 = 17
2(26 + 17) = 2(43) = 86 cm (c)
13.
3x - 5 = x + 9
3x - x = 9 + 5
2x = 14
x = 14 / 2 = 7
3(7) - 5 = 21 - 7 = 16
4(16) = 64 cm (c)