HELP PLS DUE TODAY I WILL GIVE BRAINLIEST (SHOW WORK PL TYYY)

1) Solve the proportion.
6/15=a/4

2) solve the two inequalities
1. 4k-1 ≥ -3
2. 4+x/2>2x

3) Solve each compound inequality
5m<-10 or 3m>9

4) solve each equation or inequality. If there is not solution, write no solution.
1. |y|=3
2. |5| ≤ 15

5) The ideal length of a certain nail is 20 mm. The actual length can vary from the ideal by at most 0.4 mm. Find the range of acceptable lengths of the nail.