Question

What is the inequality of 0.3(0.3x+0.8)<-0.3

Answer 1

`0.3(0.3x+0.8)<-0.3\ /:0.3\\\\0.3(0.3x+0.8):0.3<-0.3:0.3\\\\0.3x+0.8<-1\\\\0.3x<-1-0.8\\\\0.3x<-1.8\ /:0.3\\\\x<- (1.8)/(0.3) \\\\x<- (18)/(3) \\\\x<-6\ \ \ \ \Leftrightarrow\ \ \ x\in(-\infty;\ -6)`