Y² - 4y + 2y² - y

Easy question

Which of the following lines is parallel to x=4? a- 3y=9 b- y=4 c- x=2 d- x=y answer this as soon as possible xoxo lo ; )

Ten times the square of a non-zero number is eqaul to ninety times the number

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.