Can you please help me on 3n-2(-2-7n)=4(1-8n)

What is the perimeter, p, of a rectangle that has a length of x + 8 and a width of y − 1? p = 2x + 2y + 18 p = 2x + 2y + 14 p = x + y − 9 p = x + y + 7

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

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.