which of the following sets of lengths could not be the side lengths of a triangle?

3 ,5 ,7

1 ,1.25 ,1.5

5, 10.5, 17

15, 18, 30

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

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

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.