If b is positive, what is the value of b in the geometric sequence 16, a, 18, b?
someone(geno3141) has already answered this q here, u will find it if u search for the q in the google search bar.
I've copied and pasted geno3141 's answer here for now:
Geometric sequences have a common ratio, r (it's a multiplier)
We have: 16, 16r, 16r2 = 8, 16r3
Since 16r2 = 8, r2 = ½ and r = sqrt(2)/2
b = 8· sqrt(2)/2 = 4·sqrt(2)