Answer:
I am sure the answer is A
Explanation:
As you can see from the graph, the first time they pumped air, the numbers were 6, 1.2, and 2. Once they start pumping the numbers decrease. Therefore, I think the answer is A. It went to 5.7, 4, and 2 from 6, 1.2, and 2.1.
A combination circuit would be needed for security because if you had a strait circuit if any one of those sensors or the keypad was ripped off the circuit will now let the flow of electricity be possible but with a combination circuit it helps eliminate that problem because even if on flow path is cut off, other paths are still available <span />
In Excel the sum B2 and B6 simply means that B2 and B6 Numbers are adding to get a Sum, it actually like the normal Calculator, but in Excel it helps to do the calculation of your your data simple and easy, there is no hard work.
