Fantastic genius/ mathematics 2020

1.)Expand(2-5a)(2-5a)
2.)If 20 is the mean of 18, 23, x, 22 and 20. Find x.
3.) Give ten multiples each of 3, 4, and 5
4.) Factorise ma-pq+pn- qm
5.) Round off 25.5647 to 3 significant figures

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