what is the greatest positive integer w such that 3 ^ w is a factor of 9 ^ 10 ?
"what is the greatest positive integer w such that 3 ^ w is a factor of 9 ^ 10 ? 9 ^ 10 = ( 3 ^ 2 ) ^ 10 = 3 ^ 20 d . 20"
multiply(subtract(9, 10), 10)