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
7/-13y Now , i need your help with this problem because i didn't understand in class and it was my homework:
Graph each system of inequalities
1. y>-1/2x+3
y=<2/3x-2

2.y>4x
y