The mass of a jar is 1.9 kg. what is the total mass of 13 jars (round your answer to the nearest hundredth

24.7 kg

Step-by-step explanation:

1/13 = 1.9/x         Cross multiply

1*x = 13 * 1.9       Multiply the right

x = 24.7 kg         Answer

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.