You want to determine whether residents in your neighborhood support the construction of a new baseball field. You survey the residents of every fourth house. Identify the type of sample used.

A:random sample

B:self-selected sample

C:systematic sample

D:stratified sample

E:cluster sample

F:convenience sample

C: Systematic Sample

Step-by-step explanation:

50.6

step-by-step explanation:

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.