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Verified answer
10, 15, 20, 25a = 10
b = 5
Un = bn + a - b
Un = 5n + 10 - 5
Un = 5n + 5
U10 = 5(10) + 5
= 50 + 5
= 55
U20 = 5(20) + 5
= 100 + 5
= 105
U30 = 5(30) + 5
= 150 + 5
= 155