Answer:
i think it is D Beaker A is used as an experiment to see the effects of air on limestone. Beaker B is used as an experiment to determine the effects of plain water with a neutral pH on limestone. Beaker C is used as an experiment to determine how acid affects limestone. Beaker D is used as a second experiment to determine how acid of a higher concentration affects limestone compared to acid of a lower concentration. There are no controls in this experiment because a controlled experiment was not practical for this situation.
Explanation:
268-96= 172
344
She need to spend additional $344 dollars
Applying the definition, it is found that at 
, the value of the function is 9.
The definition of the piece-wise function is:
At x = 3, it enters the second definition, thus:
Thus, the value of the function is 9.
A similar problem is given at brainly.com/question/25029892
