No.
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A composite number is a number with more than two positive integer factors (itself and one). Other than these two numbers, the positive integer factors of 155 are 5 and 31.
6% of 155= 6% * 155= 0.06 * 155= 9.3
5 goes into 155 evenly. 155/5 = 31
Well, 0.20*155 is 31, and 155-31=124, therefore 20% off of $155 is $124.
Cos(-155) = cos(155) = 1 - cos(180-155) = 1-cos(25).