HELP QUICK! Find the value of x such that the data set 31.7, 42.8, 26.4, and x has a mean of 35

39.1

Step-by-step explanation:

((31.7+ 42.8+26.4+x))/(4)=35

There are four things that you add, so you have to divide by 4. Your end result is 35, so set your equation equal to 35.

4 times 35 is 140.

The stuff remaining is 100.9 + x = 140

140-100.9 is 39.1

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