Pls help me i need to fill in the boxes that dont have anything in them but i aldo need to fill in the one that says "A="

Answer:
[tex]perimeter = (5 + 3) \: units \\ = 8 \: units[/tex]
[tex]area = (5 \times 3) \: {units}^{2} \\ = 15 \: {units}^{2} [/tex]