If it is true that 22-6 = 19. then z2 + 6 = ?
N
F
S
7
31

-18

step-by-step explanation:

because mean value defines that total sum value over total number of set

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

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)