Answer the question to the best of your ability : )

7x^2y(2x-3y)

Step-by-step explanation:

Factor 7x^2y out of 14x^3y-21x^2y^2

Mr. Smith

Step-by-step explanation:

Mr Smith is using the better method because he is making use of a larger number of trials such that the result of his experiment whereby he plans to flip the coin 1,000 times, will be more accurate than the result of that of Mr Jones  that only plans to flip the coin only 10 times which allows for the large number correct outcome of the flipping of the coin to balance out the few inaccuracies. Whereby when only 10 trials are used, the few number of the inaccurate outcomes will have a larger impact on the correct result of the experiment.