The diagram below shows a sector of a circle. Calculate the perimeter of the sector. Give your answer correct to three significant figures.

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

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.

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =