You would subtract how many times Dion tagged bill with how many times bill tagged Dion, so 12 - 7 = 5
Answer:
$541.26
Step-by-step explanation:
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We can use completing the square.We add 16 and subtract 7 to both sides. Now we get m^2+8m+16=9. The left sides becomes (m+4)^2=9. Taking the square root of both sides and subtracting 4 we get -1 and -7.