What is the value of the function FX equals 4X +9 when X equals

Assume that a population of 50 individuals has the following numbers of genotypes for a gene with two alleles, b and b: bb = 30, bb = 10, and bb = 10. calculate the frequencies of the two alleles in the population’s gene pool.

What’s the answer ? use the picture to see the problem

The tile along the edge of a triangular community pool needs to be replaced? ?