TanA= 2xy/(x^2+y^2),
find sinA

Step-by-step explanation:

TanA = SinA/CosA

                                 tanA = 2xy / (x² + y²),

                                 Sin A = CosA * 2xy / (x² + y²)

its 4 because 2 times 2 is 4, if you double the number two you get four

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.