X+20≥-7 i need help pls

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.

Triangle knm is what is true about the sides of knm

10x − 5y + 14 = 0 whats the answer pls