WILL GIVE BRAINLIEST

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.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.