exam Maths Puzzle Numerical Ability

Another I have to turn in and I am still having trouble with. HELP!

Write the expression in terms of the logarithms of x and y:

log 5x^2/square root of y

y is under a square root symbol. Hope that is clear enough. Thanks!

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exam Other Question

expressions/53089 (2006-09-21 00:55:06): I need to justify each of these step, please help me with this.
5(n+4)+9n= (5n+20)+9n
=5n+(20+9n)
=5n+(9n+20)
=(5n+9n)+20
=(5+9)n+20
=14n+20
three fourths the number b is 96.