What is the common difference of the arithmetic sequence -7,-4x,-x,2x,5x Help asap please

Solve the system of equations. y= 2x y= x^2 - 15

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!

Orly uses 2 cups of raisins for every 12 cups of trail mix she makes. how many cups of trail mix will she make if she uses 8 cups of raisins?