Marten bought 7 pairs of socks for $3 each, and a sweater for for $12. Then he bought a $5 coffee, what was the change in
the amount of money Marten had?

The total amount spent would be $38

Step-by-step explanation:

Because he bought 7 pairs of socks (each costing $3) for $21, a sweater for $12 and a $5 coffee. If we add the $21 (The cost of the socks) to the $12 (the cost of the sweater) and the $5 (the cost of the coffee) the total amount spent is $38. To find out the change given subtract $38 from the money he originally had

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.