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

A solar collector and its stand are in the shape of a right triangle. The
collector is 5.00 m long, the upright leg is 2.00 m long, and the base leg is 4.58 m
long. Because of in
writing to the simplest form can someone check this for me please!

-15x^3y^3
over
-20xy^4

= 3*5*x*x*x*y*y*y
over
2*2*5*x*y*y*y*y
=3x^2
over
4y