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<15,-21>

Step-by-step explanation:

u = <3, -1>

v = <-6, -6>

9u + 2v

9 <3, -1>+2 <-6, -6>

<27, -9> + <-12,-12>

<15,-21>

add an image

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.