U15 = 36 + (15 - 1) . -6
U15 = 36 + (14).-6
U15 = 36 + -84
U15 = -48
s15 = 15/2 (36 - 48)
s15 = 15/2(-12)
s15 = 15/2 x -12
s15 = 15 x -6
s15 = -90
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U15 = 36 + (15 - 1) . -6
U15 = 36 + (14).-6
U15 = 36 + -84
U15 = -48
s15 = 15/2 (36 - 48)
s15 = 15/2(-12)
s15 = 15/2 x -12
s15 = 15 x -6
s15 = -90
semoga membantu