No.
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Any of its factors - 1,2,4,7,8,13,14,26,28,52,56,91,104,182,364,728
28 is divisible by 4 so divide by 4 728 = 4 * x 728 = 4x 728/4 = 182 x = 182
Did you mean "What is 3% of 728?" That would be 21.84.
.728 = 728/1000 (the last digit is in the Thousands place so it is the whole number over one thousand) They are both divisible by 2 so: 728 / 2 = 364 and 1000 / 2 = 500 728/1000 = 364/500 That is also divisible by 2 so: 364 / 2 = 182 and 500 / 2 = 250 That is also divisible by 2 so: 182 / 2 = 91 and 250 / 2 = 125 728/1000 = 364/500 = 182/250 = 91/125 91/125 is fully simplified and is your answer.
Yes, if x is an integer divisible by 3, then x^2 is also divisible by 3. This is because for any integer x, x^2 will also be divisible by 3 if x is divisible by 3. This can be proven using the property that the square of any integer divisible by 3 will also be divisible by 3.