I could give you the answer....but it is more important that you understand this fully...here is an excellent ( and an easy-to-understand) resource.....
http://www.purplemath.com/modules/exponent3.htm
I could give you the answer....but it is more important that you understand this fully...here is an excellent ( and an easy-to-understand) resource.....
http://www.purplemath.com/modules/exponent3.htm