Which one is the correct answer?

Name the most appropriate metric unit for each measurement like the mass of cow

Neveah and clint are baking muffins for the bake sale. they need to bake 30 muffins for their display case. clint has baked 4 so far, and neveah has baked 7. how many muffins (m) do they have left to bake? show your work!

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !