Enter the unknown value that makes this statement true.
25% of__ is 35

25/100 x X = 35

x100             x100

25x = 3,500

Divide by 25 on both sides

X = 140

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

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.