exam Maths Puzzle Numerical Ability

Can someone help me find a number log on a graphing calculator?

I need to find the number Log5(1/5).

Thanx!

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exam Other Question

Sorry I submitted this question wrong the last time. One little mistake makes all the difference.

3/x^2+4x+3 - 1/x^2-9

Sorry for the mistake! I appreciate your help!
ac Given P(a,b) and Q( 3a,5b), what is the distance from R(3a,2b) to the midpoint of PQ? I think it is sqrt a^2+16b^2 ??????????????