exam Maths Puzzle Numerical Ability

1) A computer is infected with the Sasser virus. Assume that it infects 20 other computers within 5 minutes; and that these PCs and servers each infect 20 more machines within ano

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/_B= 25 degrees and c=12 cm, find b. Thank you so much for your help. Factor by grouping:
3cd – 6cy + 2xd – 4xy
which one of these is it?
1. (3c + 2x)(d + 2y)

2.(d – y)(3c + 4x)

3. (3c + 2x)(d – 2y)

4.prime