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