A village C is 12km upriver from a village D. It takes 20mins to go from D to C and back to D by boat. If the boat travels at 6 km per hr upriver and (6+y)km per hr downriver, what is the value of y?

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.

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Acircle has a circumference of 28.36 units what is the diameter of the circle