You plan to mail surveys to different households. a box of 50 envelops costs $3.50, and postage stamp costs $0.42. how much does it cost, in dollars, to mail 400 surveys.

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