11.Combine like terms 12.The length of a rectangle is 4x + 7 and the width is 3x - 1. What is the perimeter of the rectangle? please help me with 11 and 12

11Combine like terms 12The length of a rectangle is 4x 7 and the width is 3x 1 What is the perimeter of the rectangle please help me with 11 and 12 class=