Help please i’m not very smart :)

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.

What is the value of x in the diagram below?

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.