Question

what is the relationship between y=a^x and y=loga(x) ?

Answer 1

One is the inverse of the other.
If you plot them on your calculator, they would be symmetrical to the y=x (45deg) line.

Answer 2

what two values of 'a' are most used?

Answer 3

a is the base of logarithm, for maths, most of the time is is e=2.7182818284...) or 10. For computer science, it is almost exclusively 2.

Answer 4

shame i can only give you one medal. thanks :-)

Answer 5

One is plenty for me! You're most welcome!