About how much cardboard is needed to make the inner tube for a roll of paper if the tube has a diameter of 4.5 cm and is 24 cm long?

What number must you add to complete the square x^2+12x=16

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

How many terms does the polynomial x^2 y^2 have