To square anything, simply multiply by itself. So this is simply 1.09 x 1.09 or 1.1881
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109 = 9 + 100
109*1 = 109 and 109*10 = 1090 are two.
9x squared-15x squared = -6
109 - 60% = 109 x (1 - (60/100)) = 109 x 0.4 = $43.60
109 is a prime number, so 1*109 = 109, but no other whole numbers will work.