Guys somwone help me in this

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.

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Which of the following is the graph of y= square root -x-3