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p = 3x - 4
l = x +1
a. k = 2p + 2l
= 2(3x-4) + 2(x+1)
= 6x - 8 + 2x + 2
= 6x + 2x - 8 + 2
k = 8x - 6
b. x = 12
k = 8x - 6
k = 8(12) - 6
k = 96 - 6
k = 90
=2 (3x-4+x+1)
=2(4x-3)
= 8x-6
b. k=8x-6= 8 (12)-6=96-6=90