Calculate the sum of the series: π²/3! -π^4/5! +π^6/7! -π^8/9! +π^10/

Describe the relationship between the angles of similar triangles and the sides of similar triangles

Asystem of equations has 1 solution. if 4x-y=5 is one of the equations , which could be the other equation ?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?