Is 3(–2) + 7(2) equivalent to (–3)(–3) + (–1)(1)? let negative numbers be represented with a "–" symbol and positive numbers be represented by "+" symbol. use a pictorial model to justify your answer.

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