4x +9
3x and x are like terms
And 2 and 7 are like terms
Hope this helps :D
Answer:
b > 12.71
Step-by-step explanation:
Here in this question we have to solve the inequality equation given for b (An unknown variable}
Now, the equation is 
⇒ 
We are taking the base of the log here is 10.
So,
{Since
and
}
⇒ b > 12.71 (Approximate) (Answer)