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15.
S = {1,2,3,4,5,6,7,8,9,10}
V = {1,3,7}
W= {2,4,6}
Vс = {2,4,5,6,8,9,10}
Wс = {1,3,5,7,9,10}

maka Vc ∪ Wc adalah {1,2,3,4,5,6,7,8,9,10} (D)

16. Luas trapesium
= Jumlah sisi sejajar x tinggi / 2
= (22 cm + 30 cm) x 15 cm / 2
= 52 cm x 15 cm / 2
= 780 cm² / 2 = 390 cm² (D)

17. Tinggi = 1/2 sisi
Luas Δ KLO
= 1/2 x Alas x Tinggi
= 1/2 x 12 cm x 6 cm
= 6 cm x 6 cm
= 36 cm² (B)