exam Maths Puzzle Numerical Ability

Good afternoon gang. Can anyone show me the steps and answer for this problem?

Find the GCF for this group of monomials.



16x²z, 40xz², 72z³



Much appreciated.

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exam Other Question
Please help me solve 9x square/8y square divided by 3x/16y to the 9th power.
The answer is 6x to the 4th y to the 7th. I got 6xy to the seventh. Can you please help me solve using the substitution method?

x + 7y = 16
-3x + 6y = 33