80. You do the multiplication first - giving the answer 72, then add the second 8.
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(9 × 8) − 1 = 71
8x9=72 9x8=72
Assuming you are talking about a rectangle, 9x8 = 72 sq ft
8x9=72 9x8=72 72/8=9 72/9=8 that is only 4. the question asks for 8!
There is no answer to this 9x8 is 72