Lets say figure 1 (triangle) has 3 units, as each side is 1 unit. figure 2, which has 5 units (2 more triangles are connected to figure 1). figure 3 has 7 units (2 more triangles are also added).

the question asks: write an expression, using the variable n, that could be used to determine the perimeter of the nth figure. use the expression to determine the perimeter of the 50th figure.