A school has 4 different after-school activities planned in the fall. Aaron has time to participate in 2 of these activities. How many different pairs of after-school activities can Aaron choose from the available activities?

How do i get the answer for 2/3 * 10/3

What expression is equivalent to (2x-1)(x-3)?

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