Question

How you do this question?

Answer 1

r = 95

Explanation:

log (r - 5) - 7 = -5 becomes log (r - 5) = 2. You had that right.

Now raise the base 10 to the power 'log (r - 5)' and equate that to the base 10 to the power 2:

log (r - 5) 2

10 = 10

Then r - 5 = 100, and r = 100 - 5 = 95. r = 95