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a) U1 = a = 1
b = U2-U1 = 3-1 = 2
maka :
Sn = n/2.(2a+(n-1).b)
S 99 = 99/2.(2.1+(99-1).2)
= 99/2.(2+98.2)
= 99/2.(2+196)
= 99/2 . 198
= 99 . 99
= 9801
jarak tanah ke air = -3 m
jarak katrol ke air = 2 m - (-3 m) = 2 + 3 m = 5 m
6. perbedaan jarak = 15 - 9 cm = 6 cm
7. posisi kapal selam = 120 m + 60 m = 180 m dari permukaan laut