There are 4 different parts aligned for each housing. align the 4 parts in the correct order. find the probability that all 4 are aligned correctly.

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

If there are 3.281 feet in 1 meter, how many inches are in one centimeter