9x(10-10x) simplify

i put 90x-90x^2 but it's wrong so i kinda need help

Pls never taught i’m really confused and i rlly need

How do newtons third law of motion demonstrates on a rollar coster

An art teacher made a copy of a small painting. to make the painting easier to see the teacher enlarged the area of the painting by 49%. let y respresent the area of the original painting. the expression below is one way to resperesnt the area of the new painting.find two equivalent expressions that would give the area of the new painting y+0.49y