What is one equivalent ratio for 1/3

Can someone answer these problems for me

Suppose a man is heterozygous for heterochromia, an autosomal dominant disorder which causes two different‑colored eyes in an individual, produced 25‑offspring with his normal‑eyed wife. of their children, 15 were heterochromatic and 10 were‑normal. calculate the chi‑square value for this observation.

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?