Researchers captured, tagged and released 81 sea lions in a particular area. Later, they captured 50 sea lions and, of them, 9 were tagged. About how many sea lions are in the area? *

Which expression is equivalent to 4 square root 6 divided by 3 root 2

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500