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No!
2*3*5 = 30
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If the number can be written as 2*3*5 it cannot be prime!
250 written in index form = 2.5 × 102
2x2x2x2
No. In the index form a number is expressed as a multiple of its prime factors whereas in the standard form it is expressed as a number between in the range [1, 10) multiplied by an integer power of 10. So, for example, 1728 in index form = 26*33 1728 in standard form = 1.728*103 The index form can only be used for integers.
Oh honey, standard index form is just a fancy way of saying scientific notation. So, 450 would be written as 4.5 x 10^2. It's like saying "move the decimal point two places to the left and stick a 10 with an exponent in there." Easy peasy lemon squeezy!