Ineed on this!

which of the following is an irrational number?

a. √1
b. √9
c. √45
d. √81

C sqrt(45) is irrational

Sqrt(1)=1 rational

Sqrt(9)=3 rational

Sqrt(81)=9 rational

Sqrt(45)=9*sqrt(5) irrational

So C sqrt(45) is the answer

Hope this helped. Have a great day!

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.