I NEED HELP linked pic of question

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.

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

Which property is illustrated by the following statement? if hxa rgi, then rgi hxa.