2 over 3 = x-1 all over 4

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.

Does anyone know how to do geometryme with this problem

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)