1a: a) < b) > c) >
1b: 3>
1c: 2, 0, -1
1d: -3.5, -5, -7
1e: b
1f:
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2a: d<18
2b: a<2
2c: y>5
2d: a) x>-4
3a: a<12
3b: r<46
3c: x>6
3d: r>9
4a: 4t³
4b: 155
4c: y²+2y-15
4d: 2(4ku+2u+3ky
5a: u=14
5b: 349
5c: 5x²-3x-36
