A bag contains 15 white balls and 10 black balls, another contains 20 white balls and 15 white balls. if two balls are drawn without replacement from each bag, find the probability that a)all four are black
b)exactly one of the four are white ​

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

How do you find the distance of each number from the mean

Use the irregular polygon below. show all work. a. find the perimeter. b. find the area. the angles of the irregular polygon is 2, 8, 8, and 4.