exam Maths Puzzle Numerical Ability

Multiply and simplify

9z^3/11r^2 * 121r^4/81z

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exam Other Question

Could you please solve this system by the addition method, indicating if the system is independent, inconsistent, or dependent.
I really appreciate your help. Thank you very much.

-3x + y = 3
2x - 3y = 5 Given triangle ABC similar to triangle DEF. If AB= 3 1/2 and DE=8 3/4, what is the ratio of the altitudes to the longest sides?