What is the area of a rectangle with length 1/2 and width 1/2

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

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!

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression