Question

-18<-3z-3<-15

Answer 1

-15<-3z<-12
5>z>4

Answer 2

Try a test to see if jwt625 is right. It is saying z is larger than 4 but less than 5. Give it a test value of 4.5 substituting it in the original equation:
-18<-3(4.5)-3<-15
-18<-13.5-3<-15
-18<-16.5<-15 Is this true?
-16.5 is larger than -18 that part is true.
-15 is larger than -16.5 that part is true

What is with the nope imranmeah91?