The equation of line cd is (y-3) = -2 (x - 4). what is the slope of a line perpendicular to line cd?

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4

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

step-by-step explanation:

a and d