Look at the pentagonal numbers. Use finite differences
to determine which function represents the pattern.
f(x) = 1.5x + 0.5x
f(x) = 1.5x2 + 1.5x
f(x) = 1.5x2 + 0.5x
f(x) = 0.5x2 +0.5x

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

10 b/c 5*2 =10

step-by-step explanation: