Susan is choosing a 2-letter password from the letters a, b, c, d, and e. the password cannot have the same letter repeated in it. how many such passwords are possible?

1st letter can be any of 5 letters

 2nd letter can be 5-1 any of 4 letters

 5*4 = 20

there are 20 possible passwords

the correct answer is d

hope this

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m