Does anyone know this? Need it ASAP.

Step-by-step explanation:

We have the equation:

we know that:

14*14 = 196

then:

14 = √196

Now, we can rewrite:

50 = 2*25

98 = 2*49

This is because we know that 49 and 25 are perfect squares, then:

Now we can use the common factor √2 and get:

and we know that:

7*7 = 49

5*5 = 25

then:

the value of b is:

b = 12

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.