Meff's tire pressure was 38.3 psi. after 30 laps it has changed by -1.2 psi. what is the current tire pressure ?

The negative sign in front of the 1.2 means the psi dropped, so you would subtract the amount of change from the original amount:

38.3 - 1.2 =

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

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet