Respuesta :

Answer:

840 square feet

Step-by-step explanation:

13 x 20 = 260 x 2 = 520

10 x 12 / 2 = 60 x 2 = 120

10 x 20 = 200

520 + 120 + 200 = 840

equation: (20•13)3+(12•10/2)2
answer: 900 ft sq