An elevator is 180 feet above the first floor. each second it descends 12 feet
what integer is the change in the height of the elevator each second

Step-by-step explanation:

Let x represent number of seconds.

We have been given that an elevator is 180 feet above the first floor. This means that elevation of elevator is positive 180.

We are also told that each second the elevator descends 12 feet. The elevation of elevation after x seconds would be .

The final elevation of elevation after x seconds would be , where, represents change in the height of the elevator each second.

Therefore, is our required integer.

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.