what is the greatest positive integer x such that 3 ^ x is a factor of 9 ^ 9 ?
"what is the greatest positive integer x such that 3 ^ x is a factor of 9 ^ 9 ? 9 ^ 9 = ( 3 ^ 2 ) ^ 9 = 3 ^ 18 d . 18"
multiply(subtract(9, 9), 9)