Charlotte is running at a rate of 9 km/h
what is charlottes speed in m/s

The conversion factor between km and m is 1 km = 1000 m, and between hr and seconds, it is 1 hr = 3600 s.  Let's first convert 9 km/hr to m/hr.

9 km/hr x (1000 m / 1 km) = 9000 m/hr

Then use the 2nd conversion factor to convert hr to seconds.

9000 m/hr x (1 hr / 3600 s) = 9000 / 3600 m/s = 5/2 m/s

Step-by-step explanation:

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72