Triangle ABC is similar to triangle A'B'C'. The coordinates of triangle ABC are shown in the diagram. The perimeter of triangle A'B'C' is 15 units. A dilation, center at the origin, was used to create these triangles. What was the scale factor used for the dilation? PLEASE HELP, THIS ASSIGNMENT IS VERY LATE!!! (will give brainliest)

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.