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Jawaban:

18. d

19. a

Penjelasan dengan langkah-langkah:

18. f(1) = 1+5 = 6

f(2) = 2+5 = 7

f(3) = 3+5 = 8

f(4) = 4+5 = 9

f(5) = 5+5 = 10

19. f(5) = 5-5 = 0

f(10) = 10-5 = 5

f(15) = 15-5 = 10

f(20) = 20-5 = 15

f(25) = 25-5 = 20

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