17. of the following numbers, which one is prime: 14, 13, 21, 33?
a. 14
b.33
c. 21
d. 13

D.13

Step-by-step explanation:

13 is a prime number because it cannot be divided by any other number than 1 or itself.

its 4 because 2 times 2 is 4, if you double the number two you get four

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