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-word problem questions for equations

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.

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

Which expression gives the area of the triangle shown below