In a class there are 84 pupils, 1/3 who wear glasses and 1/7 wear braces . How many wear braces and what percentage of the children wear glasses​

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.

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?