Ineed a system of equations. hurry.

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?

What is the perimeter of an equilateral triangle if each side is (x+3)?

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices