Write <em>z</em> in exponential form:

Then taking the logarithm, we get

so a is the correct answer.
Answer:
x ≈ 21.7
I rounded to the nearest tenth because the values are given in tenths. The first few digits of x are below if you are rounding to something else, as the image is cut out.
Step-by-step explanation:
(It will not let me post, so I've attached a screenshot of my explanation:)
Answer:
-4
Step-by-step explanation:
- - - - - - - -
+ + + +
4 negatives cancel out and leave you with -4
Answer:
B. $1.60 per notebook
Step-by-step explanation:
Because:
4 notebooks ÷ $2.50 (4 notebooks cost) = $1.60 per notebook