Someone help me To solve this :):):):) My brain is not functioning. Please Help as soon as can thank you

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

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take