Step-by-step explanation:
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Answer:
(x+y)(x-y)
x^2 - xy + xy - y^2
x^2 - y^2
Answer: $2.40
$60.00 x .04 = $2.40
0.106
Answer: 15 boys
Explanation: ratio 5:7
5 + 7 = 12
Number of boys = 5/12 × 36