Math problems: inequalities:

1. x + 5 < 9
2. b - 2 > -7
3. 1 > -w/3
4. 6 < -2g

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a, b and c integers and a> 1

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?