QUOTE(BuckminsterFullerene @ May 14 2007, 10:05 PM)

Hello Amazoph
Firstly
For all questions as such, you begin with what they've given you ie y=a^x. They have also told you that their graph is of log (base) 4 and x.
Hence, you should, take the log(base) 4 of both sides
Ie. Log(4)y=Log(4)a^x
Log (4)y = x . log(4)a
You should now recognise that log(4)a is the gradient because this is similar to y=mx+c
hence;
You know the gradient of the line is 0.5
so
Log(4)a=0.5
Hence
4^0.5 = a
a = 2
Glad to help!
hi,
i follow how u get the gradient to equal log(4)a,
but im confused how you got the gradient of the line to be 0.5 =/
it's probably something really simple, but i cant seem to figure it out