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Huilan's age is two times Thomas's age. The sum of their ages is 21 . What is Thomas's age?
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1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25
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If the segment op is dilated by a scale factor r=2, what is the length of segment op? a)10cm b)16cm c)6cm d)4cm
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Huilan's age is two times Thomas's age. The sum of their ages is 21 . What is Thomas's age?...
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