exam Maths Puzzle Numerical Ability

I have a log question... I am having a hard time setting up this problem... please help me..

log 25=x
5

and

log (5)^-2
5

can you please help me thank you.....

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exam Other Question

Fred bought three shirts each at the same price, and received less than $12.00 in change from a $50.00 bill.
a. what is the minimum cost of one shirt
b. what is the maximum cost of one shirt Could you please help me to simplify the following:

3^(4x-3)*a^(2x-3)/3^(2x+1)*a^(x-1)