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

1. Simplify the expression:

15x^2-x-2 / 3x^2-5x-2

2. Simplify the expression:

14x^2y^6z^9 / 7x^5y^4z^11

3. Simplify the expression:

3y^2+5yz+2z^2 / 2y^2+3yz+z^2

4
indicate the union
{a,b,c} U {a,c}