Agroup of farmers bought 28 tractors and trucks. there were 1.8 times more tractors than trucks. how many tractors and how many trucks were bought by the farmers?

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 diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .