Need help! Also if you answer add an explanation thx.

What is the difference between regular convex and concave polygons

Sheila wants to bake six muffins but the recipe is for 12 muffins . this means you only need half of the ingredients listed how much of the of each ingredient does she need? one cup and banana chips ,7 tablespoons oil , two eggs, 3/4 cups flour 1/4 cup walnuts show all you work and justify your answer using a baby toulmin.

2/3(-6y+9x) expand each expression using the distributive property