Pls help me I need help

The area of the map is the product of the length and width. write and expression for the area as the product of the two binomials do not multiply

Select the correct answer and solve for y

Dylan is evaluation the expression 13+19+7+10 at one step in his work, dylan rewrites the equation as 13+7+19+10 which property of addition must dylan have used when he evaluated the expression?