Question

3t<-15 a. t<-5 b. t>-5 c. t<-45 d. t>-45

Answer 1

3t<-15 solve for t

divide both sides by 3
3t/3 < -15/3

Simplify
t < -5

Anser is a. t<-5

Answer 2

If 3t < -15 all you need to do is divide by 3 on both sides, 

t < -5