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{ } or empty set

{point in quadrant 11}

{point in quadrant 1}

Sorry guys but as you have a small brain

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling