Hey please help me be geniune this is a timed test and I really need help will mark brianliest :( please no links I’m tired of seeing them

Answer:
510 ft^2
Step-by-step explanation:
(12*9)+(12*9)+(7*9)+(7*9)+(7*12)+(7*12) = 108+108+63+63+84+84 = 510 ft^2
Hope this helped! :)