Answer:
4
2 + 2 = 4
took me longer then I expected
A^2 - b^2 = (a-b)(a+b)
To test it, expand the right hand side.
That is not correct. I just took the test and the answer is 2/3
Well, there are 60 minutes in 1 hour, and there are 60 seconds in 1 minute, so in 60 minutes, there are 60 * 60 seconds, or 3600 seconds in 60 minutes, or 1 hour, therefore, in 1 hour there are 3600 seconds.
the machine makes 7 aliens in 2 seconds, how many will it make in 3600 seconds?

that many.