Distance is the number of units between points.
The distance that are 7 units from 4 are: 11 and -3
A distance of 7 units from 4 means:
or 
Where:
x is the required distance
Solve for x in both equations.






So, the distance that are 7 units from 4 are: 11 and -3
See attachment for illustration
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I’m not sure what e is in your equation. But I think the answer is t=5000 months. Let me know if you need an explanation
So 3 bus tickets 3(64) = $192
and 4 train tickets 4(82) =$328
add them together 192+328 =520
it would cost $520 to buy 3 bus tickets and 4 train tickets
9 buckets of water because If 1/3 is 3 than you just add 6 more buckets which is 9