Math 116 A
posted by katie .
7X+4>13 or 9x+4>23
The solution of the compound inequality is ? I am totally lost!!!!!!!!

All you have to do is solve each inequality, then pick all values for x that satisfy either one.
7x+4 > 13
7x > 17
x > 17/7
9x+4 > 23
9x > 27
x > 3
So, any x that is greater than 17/7, or which is greater than 3, solves the problem. Now, since 17/7 > 3, any value > 17/7 also satisfies the 2nd inequality.
So, the final solution is x > 3. Any value above 3 satisfies one or the other inequality. If you graph the intervals on the number line, you'll see they overlap. 
Do I use the [ ] or the () on the number line?