In a survey of 93 resorts, it was found that 30 had a spa,39 had a childrens club,11 had a spa and children club, 9 had all three features, 56 had a fitness center, 16 had a spa and a fitness center and 20 had a fitness center and childrens club. how many of the resorts surveyed had only a spa?

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.

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15