The tax would be 0.10($640) = $64.
The total cost of her purchase would be 1.10($640) = $704.
Answer:

Step-by-step explanation:
We are given the following expression in the question

Logarithmic Properties:

We have to simplify the given expression


Answer:
8/15
Step-by-step explanation:
When multiplying fractions, simply multiply the numbers straight across. First, multiply the numerators to get 8. Then, multiply the denominators and you'll get 15.