R4 = 74 what does R equal\

Which statements are true? see picture

Evaluate the expression for the given value of the variable 2×(c2-5) for c=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.