Eye color loci in humans has 2 alleles(b,B) & genotype f(bb)=.36 what is freq of the B allele?

If fr(bb) = 0.36, then fr(b) = sqrt(0.36) = 0.6. According to H-W Equation #1, fr(B) = 1 - 0.6 = 0.4. The combined frequencies of the two alleles must equal 1.