Answer:
z < 70
Plot a point at 70 and make a ray pointing towards the left.
Explanation:
-0.3z > -21
Divide by -0.3 on both sides
z < 70
(Double check, say if z was -30, plug into the inequality)
Make a number line, start from 0 and go up by 5.
You would end with 100.
Plot a point at 70 and make a ray pointing towards the left.
Hope this helps :)
Have a good day!