No, the combination lock is not appropriate. This is so as the repetition is allowed, neither permutation nor the combination rule holds true or valid.
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The answer is 13 you subtract 25 and 12
8.235 X 10 -4exponent. The exponent is negative because you moved the decimal to the right instead of left :) hope this helps!
the answer would be 10 because you have to times by 2.5 on both sides to get t on its own.
4 × 2.5 is 10
