Y varies inversely as x. If x= -5 then y =10. Find y when x=4

y = - 12.5

Step-by-step explanation:

Given y varies inversely as x then the equation relating them is

y = ← k is the constant of variation

To find k use the condition x = - 5 when y = 10, then

k = yx = 10 × - 5 = - 50

y = ← equation of variation

When x = 4, then

y = = - 12.5

i think it would be 42cm

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