Thw water level of a river in town of carson decreased by 4 1/4 feet over 3 month period . Witch of these describes the average monthly chsnge in the water level of the river?

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y