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2.ll dan lv
56 = 2(3x + 5 + 2x - 2)
56 = 2(5x +3)
56 = 10x +6
50 = 10x
x = 5
panjang = 3(5) + 5 = 15 + 5 = 20cm
lebar = 2(5) -2 = 10 - 2 = 8cm
luas = 20cm x 8cm = 160cm² (B)
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5. umur ani sekarang = ½ x 28 = 14 tahun
umur ani 5 tahun lagi = 14 + 5 = 19 tahun (C)