Speaking from the third-person's point of view, it is: 'You seconded that?". But if YOU want to second that, you would say, "I second that.".
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In general, infinity to the zero is undefined ------------ Seconded. You'll have to figure out some algebra tricks to (re)move the exponent before continuing the evaluation.
It means as each second passes (timewise)
A second is divided into milliseconds and there are 1000 milliseconds in a second.
feet per second x 0.3048 = meters per second
1 mile = 1.609 km = 1609 meter 9.81 meters/second/second = 9.81/1609 miles/second 2