Can you tell me what is 4-3•x

if the symbol there between the 3 and the x is a period, it is a different way of showing multiplication or the *(×)sign.

Step-by-step explanation:

4-3*x

=1x

=x

but if it's not, I'll have to check again. this would not be th answer

6 spoons of sugar for every 21 cups of flour

step-by-step explanation:

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