The pyraminx is a rubik’s cube-toy in the shape of a tetrahedron. the pyraminx shown below has edges of 15cm long and a vertical height h=12.2 cm. the triangle drawn with dashed lines is a right triangle. what is distance r?

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?

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

Me i’m stuck on all these questions besides the two bottom ones