Help me with 6 and 7 please

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.

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°