Solve the system of equations -2x-3y=-36−2x−3y=−36 and -x-2y=-21−x−2y=−21 by combining the equations.

What is the exact volume of the cylinder (radius 13 in., height 30 in.)

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.

What expression is equivalent to (2x-1)(x-3)?