In a g.p the 2nd and 4th term are 0.04 and respectively find ,the common ratio and first term.
ar = .04
ar^3 = ????
once you find the missing data, divide the 2nd equation by the 1st,
you will get r^2 = ???
etc
ar^3 = ????
once you find the missing data, divide the 2nd equation by the 1st,
you will get r^2 = ???
etc