Answer:
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Step-by-step explanation:
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1) 21.83
2)173.8
3)12
Hope this helps :)
(cx)2-(dy) 2
Formula a2-b2= (a+b) (a-b)
By given formula
(cx)2 - (dy) 2 = (cx+dy) (cx-dy)
It cost her this much = 3×15 = 45
