Out of all the measurements used in the calculation, find the one with the least number of significant digits. This will be the limiting factor of how many significant digits the answer should have.
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74.6, to 3 significant digits.
The number 12.300 has five significant digits. The nonzero digits (1, 2, and 3) are all significant, as well as the zero after the decimal point. Zeros between nonzero digits (like the zero after the decimal point) are also considered significant.
No. Pi is a transcendental number which is a kind of irrational number. It has an infinite decimal representation which does not end nor does it go into a recurring cycle. That does not mean that there are no repeated digits, it simply means that digits may repeat themselves for a little while but then continue in what appears to be a random pattern. Not only does it not have an infinite decimal representation, but infinite binary, ternary, etc representations.
It's a number system. For example, base 10 means that you have ten digits, 0 1 2 3 4 5 6 7 8 9, before you go to double digits (10). With base 2, you have only two digits, 0 1, before you go to double digits (10).
Answer: No. Pi is irrational; we could never find the last digit, because the digits go on forever. Also, being irrational means that the digits don't repeat periodically.