Simplify: –6(x – 3) – 4(y + 5) + (–5)(7 – 2b)
a. –6x –4y – 10b – 3
b. –6x –4y + 10b – 37
c. –6x –4y + 10b + 3
d. –6x –4y + 10b + 33
i have a difficult time combining like terms. can someone explain it to me?

all work is shown and pictured

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