In 2010, the world population was about 6.86 billion people. If this population were spread evenly over Earth’s land area, about how many square feet of area would each person have, on average?

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