Final answer:
To find the stone needed to surround the garden, calculate the perimeter of the rectangle formed by the given points. The perimeter is 20 feet.
Step-by-step explanation:
To surround the garden with a stone path, Marina needs to find the perimeter of the rectangle. The four points given form a rectangle, and the sides of the rectangle represent the length and width of the garden. To find the perimeter, we need to add the lengths of all four sides.
Length = Distance between (-2, 1) and (4, 1) = 4 - (-2) = 6 feet
Width = Distance between (4, 1) and (4, -3) = 1 - (-3) = 4 feet
Perimeter = 2 * (Length + Width) = 2 * (6 + 4) = 20 feet
Therefore, Marina needs 20 feet of stone to surround the garden.