Solve this equation.
5x - 7= -12
 25
 1
 -1
 -25

x = -1

Step-by-step explanation:

5 x - 7 = =12

Add the 7 to the other side

5x = -5

divid the 5 to leave x alone

x = -1

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.