solve and write in interval notation??

Question

-6z<0 

Answer 1

    -6z<0 

     6z>0        [multiply by -1 reverses the sense of the inequality]

      z>0        [divide by +6 keeps the sense of the inequality]

     (0,∞)          [write in interval notation]

Answer 2

When we multiply a negative number by a positive number, the product is less than zero, or just negative number.

 

 

z is all positive numbers.

In interval notation is  

 

(0, ∞)