exam Maths Puzzle Numerical Ability

Simplify.

(y^4/z^10)^3


This is my answer is it right?
y^7 / z^10


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exam Other Question

3/2L=-4m what is L These problems are really giving me some trouble, will someone please help!
If:
tanA=(-2/3) and 90 degrees < A < 180 degrees, find sinA.

Thank you again for your time, Natalie