Write the number 4.9 x 10^-5 in standard form

Which fraction is equal to 1hole and 2/5? a.3/5 b.75 c.57 d.73

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible