book Maths Puzzle Numerical Ability

Please help:

-3/8<-1/4x+1/8<5/8

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book Other Question

Please help me with this problem.
Factor Completley.
6w^6-40w^5+50w^4

this is the answer I came up with please let me know if it is correct
2w^4(3w^2-20w^5+25)

Thank you
express the sum or difference of the logarithm. express powers as factors

log x^3(sqrtx+1)/(x-2)^2

I really dont understand how to do these. Can some one please expain them