Please answer part a and b thank you!! and don't forget to show proof

Step-by-step explanation:

First part

y-intercept of the line means where the line crosses the y-axis

Here we can see that the line crosses the y-axis at 4 so the y-intercept is 4 hence (0 , 4) is the point.

Second part

The point (0 ,4) represents 0 hours after sunrise the temperature is 4°C(degree Celsius) which means when the sun has not risen the temperature is 4 degrees

justin bieber ml.

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