Answer:
C. 
Step-by-step explanation:
To find the value f b, we need to compare the exponents.
The given exponential equation is:

Recall and apply the following rule of exponents.

We apply this rule on both sides to get:

Simplify the exponents on the left.

Comparing exponents of the same variables on both sides,


Divide both sides by 6.


20 so -10 from 30 so the 18 is -10 right hope dis helped
Is their any multiple questions
Answer:
You need to understand construction chapter to answer your question.