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

if john bought a calling card and used 20 min and now its worth $4.00 and then used it again and used 46 min. altogether with only $2.96 of call time left.

a. for this calling c Please help w/ the following:

e^-3x=3.1

Thank you.