Answer:
Step-by-step explanation:
7 + 3 + 5 + 15 = 30
I thin the best answer among the following choices base on the data you have given and the formulas, to be honest I didn't really understand the instructions but in your diagram, this is just my suggestion but no an answer, the value of #1 2nd option from the left of the first line and the #2 is the last choice from the first line. I hope this would help
Yes, you're right! The first step is rewriting the equation as

Subtract
from both sides:

Use the property
to rewrite the equation as

Divide both sides by 

Alternative strategy:
Consider both sides as exponents of e:

Use
to write

Divide both sides by a:

Consider the logarithm base b of both sides:

The two numbers are the same: you can check it using the rule for changing the base of logarithms
19=9-16 would probably be something to go off of and begin your thought process with.
Just go to math papa. It solves all kinds of problems like these. Anyways the answer is a=4. Please give me a thanks.