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b = 13-8 = 5
Un = a+(n-1) b
Un = 8+(n-1) 5
Un = 8+5n-5
Un = 5n+3
U100 = 5.100+3
U100 = 500+3
U100 = 503
2) a = 100
b = 96-100 = -4
Un = a+(n-1) b
Un = 100+(n-1) (-4)
Un = 100-4n+4
Un = -4n+104
U100 = -4.100+104
U100 = -400+104
U100 = -296