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CAN SOMEONE TELL ME WHAT I DID WRONG IN THIS QUESTION. THE ANSWER SAYS ITS 80ft^2. PLS TELL ME HOW THEY GOT THAT ANSWERR!!!!!!!!!!

CAN SOMEONE TELL ME WHAT I DID WRONG IN THIS QUESTION THE ANSWER SAYS ITS 80ft2 PLS TELL ME HOW THEY GOT THAT ANSWERR class=
CAN SOMEONE TELL ME WHAT I DID WRONG IN THIS QUESTION THE ANSWER SAYS ITS 80ft2 PLS TELL ME HOW THEY GOT THAT ANSWERR class=