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so we solve for rate first? @JoannaBlackwelder
We are given rate. We are looking for time. So, solve for time.
Can u help me with that please @JoannaBlackwelder
|dw:1439920734718:dw| To solve for time, we need to get it by itself.
|dw:1439920766408:dw| r is currently multiplied by t, so we divide by it to get rid of it on that side. And what we do to one side of an equation, we have to do to the other side.
Does that make sense so far?
kinda, I get confused with letters in math @JoannaBlackwelder
Ok, yeah, they can be kinda tricky. Let me show you another way that doesn't use letters.
Start with the distance the signal travels:|dw:1439921098416:dw|
|dw:1439921144658:dw| And since the signals travel 3x10^8 meters in 1 second, we can use that ratio as a conversion factor.
Since for the signals 1 second equals 3x10^8 meters of travel
And multiplying by a fraction of two things that are equal is just multiplying by 1, which doesn't change the value.
|dw:1439921324634:dw| The units of m cancel since one is in the numerator and the other is in the denominator.
And we are left with a number of seconds. :-) Does that method make more sense?
It does make more sense.. @JoannaBlackwelder