Optional Conversion Factor Assinment

See previous conversion factor post and do the following problems - 3a, 3e, 11, 12c, 17a, 17b, and 25

All problems must use conversion factors, have correct significant significant figures, and be in proper scientific notation.  Remember - optional assignments are designed to give you practice on skills we will use frequently and to help your grade so...please have me check your work before turning it in!