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The sequence is Un = 19 - 3n so the 20th term is 19 - 3*20 = 19 - 60 = -41
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1.50 = 1.50/1 = 15/10 = 3/2
1/15 because: 10+5=15 or 15/1 15/1 flipped is 1/15
10% = 1/10 15 + ((1/10)(15) = x 15 + 1.5 = x x= 16.5