exam Maths Puzzle Numerical Ability

factor/simplify:

12y^5z^4 + 9yz^3

I am really stuck on factoring. Help is really appreciated. Thank you!

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exam Other Question

When all n teams in a league play every other team twice, a total of N games are played, where
N=n^2-n.
A basketball league has 11 teams and all teams play each other twice. How many games are played? I need help with this word problem please; find the distance from third base to first base on a baseball diamond if the distance between bases is 90 feet.