Simplify (89^6x91^3)^0

What is the standard form of -5x^2+2x^4-11+x^3+3x

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.