Adrian is 5 years less than half of his brothers josh. if adrian is 9 , how old is josh

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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.

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia