Hi there!
When working with symbols like <, we can treat them like an equal sign when isolating a variable. That means we can divide, multiply, subtract or add when moving parts of the term over the < sign (like the equal sign).
-b<4
(Treat -b like a -1 when dividing, since that is the variable's coefficient)
(-b/-1)<(4/-1)
b<-4
We also switch the sign because we are working with a negative (it is the opposite of before).
b>-4
The answer is therefore D.
Hope this helps!
