book Maths Puzzle Numerical Ability

please help
solve the inequality -4y+6<-14

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I am in an advanced algebra 2 class, and i am having a lot of problems understanding one-variable equations and inequalities. Can you please explain it thoroughly for me and add so c= circumfernce d= diameter r= radius pie= 3.14 or 22/7

c= 44 meters
what is the radius
formula c=2*3.14*r
i do not know the answer