Answer :The first one
Step-by-step explanation:
Answer:
(r-7) ÷ (6+?)
Step-by-step explanation:
I don't know what the last number is
The general slope-intercept form equation is:

In this case, m=-2 and with the point (4, 10) we can find the value of b:

We found that b = 18, so:
First, it is to be understood that logarithms allow a person to subject a number as an exponent of a base. As an example of ways in which logarithm is used to aid us in difficult calculations is when we calculate for the pH of a substance which has a formula of,
pH = -log[H+]