How many solutions to that problem

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.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?