Hopefully, this helps you answer the question. You can ignore the Q1 and Q2.
Answer:
5
Step-by-step explanation:
okay, let's start with the -(-2). In math, the negative of a negative is positive. so basically, the -(-2) becomes a positive. The positive version of -2 is +2. So, the equation becomes 3+2, which is 5.
Four million, seven hundred thirty thousand.
Using an exponential function, it is found that the mass of the radioactive sample at the beginning of the 13th day of the experiment was of 169.1 mg.
<h3>What is an exponential function?</h3>
A decaying exponential function is modeled by:

In which:
- A(0) is the initial value.
- r is the decay rate, as a decimal.
At the beginning of the first day of the experiment the mass of the substance was 500 grams and mass was decreasing by 8% per day, hence A(0) = 500, r = 0.08, and the equation is given by:



At the 13th day, the mass is given by:

More can be learned about exponential functions at brainly.com/question/25537936